Financial Constraints and Exports: An Analysis of Portuguese Firms During the European Monetary Integration

Financial constraints are a key determinant that hinders firms' ability to export. This paper analyses the nexus between these constraints and firms' engagement in international trade, as well as it explores the impact of the European monetary integration process upon firms' financial constraints. Therefore, we estimate cash to cash-flow sensitivities for different periods (1996-2000 and 2001-2004) and different groups of firms, according to their exporting and importing activity. Our results indicate that, depending on their international openness, the European monetary integration seems to have generally helped reducing the degree of financial constraints faced by Portuguese firms. Additionally, our findings suggest that rather than unconstrained firms selfselecting into exporting firms' constraints were reduced after they started exporting.


Introduction
The causality flow between financial constraints and openness to foreign markets is rather unclear.On one hand, open firms may have access to foreign finance and, especially if they are strong exporters, see their domestic credit conditions improve.On the other, these firms may only export because they were able to overcome the financial constraints barrier.
Effectively, there are additional costs to explore foreign markets and the required investment may be financially constrained.As a result, only firms that are not financially constrained are able to export.This paper explores how financial constraints relate to the openness of firms to foreign markets, in particular to their exporting and importing activities.Additionally, it evaluates the changes in firms' levels of constraints driven by a monetary integration process (the European Common Currency).While we find an inverse relationship between export intensity and financial constraints, we cast some doubts on the argument stating that only unconstrained firms self-select into export behaviour.In fact, a priori constrained firms are also able to export and there are significant improvements in firms' ability to raise external funds once they start exporting.Furthermore, we argue that while in general the monetary integration reduced the constraints faced by Portuguese firms, these were affected differently depending on their importing and exporting activities.
After the accession to the European Economic Communities (now the European Union, EU) in 1986, Portugal experienced not only the creation of the Common Market in 1992, but most of all the introduction of the Common Currency in 2001.The monetary integration that culminated in the Euro brought several changes, of which we should point out the reduction of interest rates (annualised benchmark interest rate fell from 7.2% in 3 The paper is organized as follows.Section 2 makes a brief discussion of the literature on financial constraints, firms' exports and monetary integration.In Section 3 we discuss the dataset.Section 4 describes our empirical methodology, while Section 5 presents the main results.Finally, Section 6 pulls the pieces together and concludes.

Measuring financial constraints
The abstract nature of the concept of financial constraints (albeit for subjective firm selfevaluation, it is not directly measurable) has challenged researchers, mostly on empirical grounds, to consistently measure these constraints.In fact, even on theoretical grounds, it is difficult to come up with a clear-cut definition of financial constraints.If on one hand, we can broadly say that financial constraints exist whenever there is a wedge between the costs of obtaining internal and external funds-following Kaplan and Zingales's (1997) definition that virtually covers every firm-, on the other, we prefer to define financial constraints as the inability of a firm to raise the necessary amounts (usually due to external finance shortage) to finance their investment and growth.
Despite theoretical literature identifies difficulties in the access of firms to external funds, empirically there is no consensus on how to measure financial constraints (see Hubbard, 1998 or Carreira andSilva, 2010 for a discussion).While some authors may resort to the primordial Fazzari, Hubbard and Petersen (1988) measure of Investment-Cash Flow Sensitivities (e.g.Bond et al., 2003), others check if parameter restrictions of a derived reduced form Euler equation for investment based on Whited (1992) are satisfied (e.g.Harhoff, 1998).
Recently, analyzing firm's demand for cash, Almeida et al. (2004) advance that the level of financial constraints can be measured by the sensitivity of cash to cash-flows (CCFS).They argue that only constrained firms will manage liquidity to maximize their value.The rationale behind is that while constrained firms need to save cash out of cash flows in order to take advantage of future investment opportunities, unconstrained firms do not, as they are able to resort to external finance.Meanwhile, firms that hold cash incur in opportunity costs associated with present investment opportunities.As a result, only constrained firms will need to optimize their cash stocks along the time, in order to maximize their profits and hedge against future shocks.Therefore, one can expect that estimates on the sensitivity of cash stocks to cash-flow would be positive and significant for constrained firms, while no such relation should be expected for unconstrained ones.In fact, Hahn (2010) supports that holding liquid assets may work as a good hedging policy for firms, when there are imperfections in financial markets.To our knowledge, only a few works have used this approach so far (see Silva and Carreira, 2010 for details).
Finally, other strategies include the construction of indexes based on variables that are generally agreed to be good proxies of constraints or, if data is available, resort to the subjective firms' self-evaluation of constraints (see Carreira and Silva, 2010).

Financial constraints, trade and monetary integration
Financial constraints seem to be an important factor to take into account when analysing international trade, as suggested, for example, by the theoretical models of Chaney (2005), Manova (2010) and Broll and Wahl (2011).These models are based on Melitz (2003), that already recognizes the importance of fixed costs when firms decide to export.However, in such models financial constraints are seen as an exogenous barrier to export, even though we provide evidence that firms that start exporting experience a reduction in constraints.
Shipping goods across countries may entail significant additional costs than selling them in the domestic market, not to mention jurisdiction differences between countries (Bekaert and Hodrick, 2008).Even though one should expect a negative relationship between financial constraints and exports, it is not clear whether exporting reduces financial constraints or unconstrained firms self-select into exporting.On one hand, start exporting may lead to more stable cash-flows due to sales diversification, that hedge against demand side shocks (Bridges and Guariglia, 2008).Moreover, exporting may signal efficiency to investors (Ganesh-Kumar et al., 2001), not to mention that such firms may additionally gain access to foreign finance.On the other hand, firms face significant sunk costs when they start exporting, thus financial constraints may work as a major barrier to export activity.In fact, Bellone et al. (2010), for French firms, find that financial constraints work as an ex-ante barrier to export, since less constrained firms self-select into exporting behaviour.
Examples of this self-selection effect can also be found in Greenway et al. (2007) for the UK, Manole and Spatareanu (2010) for the case of Czech firms, Forlani (2010) and Minetti and Zhu (2011) for Italian firms or in Berman and Hericourt (2010) for 9 developing and emerging economies.Therefore, if financial constraints work as a major barrier to export then, in order to foster exports, incentives particularly designed to alleviate such constraints are certainly warranted. 3Recently, for the Portuguese case, Silva (2011b) analyses firms financial condition prior to export and uses an index of constraints based on Bellone et al. 6 (2010) as dependent variable for treatment effects estimation of the impact of exports upon financial constraints.His results support that not only there is a self-selection effect, but also that such constraints are reduced once firms engage in exporting activity.
When it comes to financial development and integration, while previous empirical literature, in general, found that it alleviates firms' financial constraints (Carreira and Silva, 2010), recent studies analysing the impacts of financial crises, put these results into perspective.As an example, Popov and Ongena (2011), comparing both Western and Central with Eastern European countries, find that interbank market integration has reduced the level of constraints, especially in highly competitive banking sector markets.However, there were significant risks of overleveraging when integration took place at an accelerated pace.Nonetheless, Amiti and Weinstein (2009), for Japan, find that financial constraints severely affect exporting activity during financial crisis, while Chor and Manova (2011), using US imports data find that, during the recent financial crisis, higher interbank interest rates led to lower exports especially for firms in more financially constrained sectors.For the European case, we should also stress that monetary integration came along, among others, with the loss monetary policy instruments.Still, the levels of financial constraints seem to be lower in bank-based systems (see Carreira and Silva, 2010 for a survey or Hernández-Cánovas and Martínez-Solano, 2010 for an example), especially for short-term finance (Kunt and Maksimovic, 2002).Gorg and Spaliara (2009), comparing firms operating in the UK and France, find that firm failure is more sensible to financial variables for firms in the "market-oriented system" of the UK.Additionally, they find that continuous export behaviour increases firm survival.
Overall, not only there is still much to be said with respect to the causality flows between financial constraints and degree of openness, but also the real benefits of the European monetary integration process are, still nowadays, rather unclear and very debatable.Specifically, despite the extensive literature on firm's financial constraints, the consequences of such processes upon the ability of firms to raise the necessary amounts to invest, grow and export are still to be fully explored.Keeping in mind that no consistent measure of financial constraints has yet been developed, we test the following hypothesis: i) Monetary integration alleviates financial constraints and benefits mostly open firms; ii) Financially unconstrained firms self-select into exporting activity.Inferences using this sample, representative of Portuguese firms, may be made with respect to, at least, other bank-based economies.

Data
The dataset used in this work was constructed from the combination of Inquérito às Empresas Harmonizado (IEH), an annual business survey, and Ficheiro de Unidades Estatísticas (FUE), both collected by the Portuguese National Statistical Office (INE).The former dataset comprises information on firms' balance sheets, while resorting to the latter, that contains information about firm's generic characteristics-including size, age and main sector of activity-, allows to track firms trough time, thus constructing a large unbalanced panel of firms. 4or the purpose of this paper the following cleaning procedures were made.First, we eliminated firms with less than 20 employees due to the lack of quality of information reported by such firms.Second, we focus only on the industry and part of the services sector, thus eliminating the agricultural and financial sectors (the latter would bias the estimation favouring unconstrained firms).Observations that were reported either missing or with unreasonable values were dropped. 5As a result we have a large unbalanced panel of 22.651 firms for the period 1996-2004 resulting in 86.455 observations.Further details on the construction and description of the variables used are available in the Appendix.
The advantage of using this dataset is that it comprises information from firm's balance sheets for the universe of firms operating in Portugal with more than 100 employees and a large representative sample of Portuguese firms with more than 20 employees.The final dataset is representative of the Portuguese economy, covering all sectors and industries of economic activity (with the exceptions previously outlined).
However, a major pitfall of this dataset is the inexistence of market information about firms.Since we only have access to a code number of each firm, we are not able to match the dataset with information from, for example, stock markets.Still, only a few firms in Portugal are publicly traded (most of them within the financial sector), hence the benefits of such extension of the dataset would be negligible.Additionally, information on firms is limited to a relatively low level of disaggregation of balance sheets.Finally, by dropping from the database all firms with less than 20 employees, we are cutting off a significant number of observations.Even though information on these firms lacks in quality and further increases the unbalancedness of the panel, smaller firms would, a priori, be more financially constrained (e.g.Cabral andMata, 2003 or Oliveira andFortunado, 2006, both for the Portuguese case).Consequently, our results might be slightly downward biased when it comes to the level of firms' financial distress.Nevertheless, such firms are typically closed (see section 5.1 for the relationship between size and openness), therefore they would not influence the analysis on exporting and importing activities.Almeida et al. (2004) construct an alternative model of liquidity demand and derive an empirical equation to estimate CCFS.The financial nature of the cash stock variable is a shield against missmeasurements in Tobin's Q (usual control for investment opportunities) and investment opportunities hidden in cash-flow because it is not expected that firms will increase their cash stocks if cash-flow signals a new\better investment opportunity, unless they are financially constrained.However, as pointed by Acharya et al (2007), financially constrained firms will only use cash to increase cash stocks if hedging needs are high (investment opportunities), otherwise they use cash to reduce debt.Therefore, we control both for debt issuances as well as for investment opportunities.Additionally, as pointed by Almeida et al. (2011) in a subsequent paper, cash may not be the only way to transfer resources across time, since firms may invest in relatively liquid assets, other than cash.As a result, we try to control for this effect through investment in non-cash net working capital and financial investments.

Methodology
Keeping these caveats in mind, we follow of Lin (2007) and use the sum of net debt and equity issuances ‫ܵܵܫ(‬ ,௧ ), as well as interest rate variation, instead of the variation of short-term deb.The former modification is due to the fact that debt and equity issuances, while being a signal of easier access to external funds, might have a significant impact upon cash stocks (by accounting procedures), so we control for such effect.With respect to the latter, firms may decide to reduce their borrowings or pay back debt according to expected interest expenses.However, instead of benchmark interest rate variation, in our baseline specification we use variations of interest paid ‫ܶܰܫ∆(‬ ,௧ ), which allows for firm heterogeneity and thus can also be seen as a form of credit rating.Furthermore, we also control for financial investments ‫ܫ݊݅ܨ(‬ ,௧ ), that not only are a demand for cash but may also work as an alternative way to transfer resources across time.In both specifications, all variables are scaled by total assets (except the control for firm size).As a result, we have the following empirical specification: where ‫ܵܥ∆‬ ,௧ is the variation in cash stocks of firm i in period t, ‫ܨܥ‬ ,௧ the cash-flow, ܵ ,௧ is a control for firm size (log of total assets), ‫ܫ‬ ,௧ investment, ‫ܥܹܰ∆‬ ,௧ is the variation of noncash net working capital, ݀ are two-digit industry dummies (CAE rev.2.1) and ߝ ,௧ the error term.We do not have financial markets information that would allow us to compute Tobin's Q.Therefore, we use sales growth ‫ݕ∆(‬ ,௧ ) to proxy investment opportunities.This measure is often used in empirical work on countries with less developed financial markets where information on firm's market value is scarcer (see for eg.Budina et al., 2000or Konings et al., 2003).Additionally, the use of Tobin's Q is also methodologically questionable.Firstly, marginal Q is unobservable, so researchers use average Q as a proxy-see Hayashi (1981) for the derivation of average Q.Secondly, the introduction of Q directly into the estimation of investment models for the purpose of analysing financial constraints may cause the sensitivities to cash-flows to be overestimated, as they might contain information about investment opportunities that were not captured by Q- Alti, 2003, in a model where financial frictions are absent, shows that, even after Q correction, firms exhibit sensitivities to cash-flow.
The financial and investment covariates are endogenous, so we estimate the model using instrumental variables (IV\GMM) with fixed effects to take account of unobserved firm-level heterogeneity and panel-robust standard errors.The set of instruments includes twice lagged cash flow, twice lagged sales growth, lagged investment, lagged variation of noncash net working capital, number of employees, lagged bond issuance and lagged variation in interest payments. 6n an attempt to capture the effects of monetary and financial integration, we split our sample into two major periods, before and after integration (i.e. up to 2000 and from 2001 onwards).Even though the integration processes is continuous, we pick this breakpoint for two main reasons.First, we only have access to the period 1996-2004, consequently, to guarantee a consistent estimation that takes advantage of lagged variables, we must guarantee that the subpanels have at least a 3 year depth (preferably 4 year to have a larger number of observations for a more efficient estimation).7 Accordingly, our breakpoint should be either on 1999 or 2000.Second, since the Euro was introduced on the 1 st January 2001, a landmark for the monetary integration process, we expect that the possible benefits would be observed from 2001 onwards.Additionally, it is reasonable to expect that the real effects of the potential benefits from the ongoing integration process before 2001 would be subject to a "policy lag", therefore only having a significant impact on firms during the subsequent period.As a result, we expect that the bulk impact of the integration process would be felt during the period 2001-2004. 8  In order to capture the effects of integration upon financial constraints by different classes of firms, according to their degree of openness to foreign markets, we construct a score that identifies firms as closed, open and, within open firms, those with low and high levels of openness (see Appendix for further detail).Consequently, we obtain different subsamples of firms depending on their exposure to European markets.Over the period, the EU, on average, accounts for 75% of the total exports and 89% of imports.As a result, we focus mainly on the degree of openness towards the EU.In fact, the results using a broader definition that covers total exports and imports remain unchanged. 9The same procedure is made with respect to exports and imports, that we then classify as levels of export and import intensity, respectively.With the purpose of comparing the CCFS estimates across subsamples, we compute the confidence intervals and perform formal Wald tests10 .The robustness of the inverse relationship between financial constraints, degree of openness, export and import intensities is checked by introducing interaction terms between cash-flow and these variables (Table A1 in appendix).Finally, in order to compare firms' constraints before and after shifting into open, exporting or importing activity, we group firms that moved from closed to open, started exporting and importing, respectively.We further divide the period of time, for each firm, according to the moment they shifted.

Summary statistics
Table 1a allows us to compare mean values, before and after monetary integration as well as by degree of openness, of the main variables used in the estimation.It is clear that after monetary integration mean variation of cash stocks and size (total assets) increased during the period, while mean cash-flow, sales growth, investment, debt and equity issuances, benchmark interest rate and degree of openness decreased (columns 2 and 3). 11Additionally, while firms faced a mean decrease in interest paid, the mean variation in non cash net working capital increased.If instead we compare different levels of openness, it is possible to see that, for the whole period, differences between less open and highly open firms (columns 5 and 6) are, in general, larger than differences between closed and slightly open firms (columns 4 and 5).This indicates that firms with no or a low level of openness appear to be quite similar.However, when we further distinguish between levels of export and import intensity (Table 1b, columns 1-3 and 4-6, respectively), this pattern is not as clear.While firms with higher levels of both import and export intensity are larger and face both lower cash stock variation and higher cash-flows (which should be expected at least for heavy exporters and might be a sign of lower constraints), intensive exporters are distinct from intensive importers when it comes to sales growth.In fact, while for higher levels of export intensity firms face lower sales growth, the opposite is true for higher levels of import intensity.This is rather puzzling, in particular for the case of exporters, since we would expect that sales would increase with higher levels of export intensity, even though it may well depend upon economic growth abroad.This odd result is also evident when we compare firms before and after they shifted into exporting or importing (columns 7-10).12In addition, for both of these groups of firms, they face larger cash stocks variation and lower cash-flows, once they shifted, which is in contrast with the statistics found for different intensities.Silva and Carreira (2011) Table 1c reports the Spearman's correlation coefficients for the main variables used and by different sub-periods. 13Firstly, we should point that the positive association between cash-flow and both changes in cash stocks and investment is slightly larger for the first period, which may provide the first insights on possible differences in CCFS (as well as ICFS).14Secondly, we should highlight that whereas in the first period there is a significant positive correlation between the benchmark interest rate and sales growth, this association is negative and significant in the second period (which may well result from the economic cycle).Meanwhile, the correlation between benchmark interest rate and cash-stock variation is only significantly negative for the first period.This latter pattern is also verified when it comes to the correlation between exports and both cash stock variation and sales growth.Additionally, there is a strong positive association between size and both export and import intensity, suggesting that larger firms are those that export and import the most, which is not unexpected.15Furthermore, the extremely high and significant correlation between import and export intensities is also as expected and indicates that defining degree of openness as the combination of both is sensible.Finally, the positive correlation between cash-flow and both export and import intensity is higher and strongly significant for the second period, pointing to potentially larger benefits for international firms after the Monetary integration.

Monetary integration
Portuguese firms, during the period 1996-2004 were, on average, financially constrained.
Table 2 shows that before monetary integration firms saved, on average, 25 cents out of each euro of cash flow, meanwhile after integration the CCFS was reduced to 0.183 (first line of columns 2 and 3, respectively).A formal Wald test rejects the hypothesis that the CCFS coefficient after integration is the same as before integration, at the 95% level.If we abstain from controlling for the money market, the difference in CCFS is also large and statistically significant (columns 6 and 7). 16Noteworthy differences are also found with respect to the impact of sales growth, size, debt and equity issuances and interest payments variations in the cash policy of firms.The Euro landmark is further emphasized if year dummies are introduced (column 1).Even though a comparison between the two periods with year dummies is not econometrically feasible, in a regression over the whole period 1996-2004, only the dummy corresponding to 2000 is statistically significant. 17This may indicate that, in this particular year, there were changes that significantly affected firms' cash policy.Alternatively, if we control for the evolution of the benchmark interest rate (columns 4 and 5), it is possible to observe that not only the CCFS difference between periods is much lower (and not statistically significant), but also that there is a huge difference in the impact of the benchmark interest rate between periods (negative for the first period and not different from zero in the second). 18This result indicates that the evolution of interest rates (fell from 7.2% in 1996 to 2.1% in 2004), that mirrors the integration process, were an important determinant of firms' cash policy.Therefore, even if firms anticipated this effect, it helps in explaining the differences in CCFS between periods (columns 2-3 and 6-7) and supports the analysis distinguishing each period.VARIABLES 1996VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004 (  1) as baseline estimation (columns 2 and 3).In column (1) we introduce year dummies, while in columns ( 4) and ( 5) we use the benchmark interest rate (R).In columns ( 6) and ( 7) we omit both ‫ܶܰܫ∆‬ ,௧ and R. All regressions include two-digit industry dummies (CAE rev.2.1).Robust standard errors in parentheses.***, **, and * denote statistical significance at the .01,.05,and .10levels, respectively.Tables with confidence intervals and further test statistics available from the authors on request.Some of the statistics in this table were reported in Silva and Carreira (2011)

Exporting and importing
As expected, Table 3 shows that there might be an inverse relationship between the degree of openness to foreign markets and financial constraints since, for the whole period, the higher the openness, the lower is the CCFS (columns 1-3 report the CCFS estimates that are all statistically different).This result may arise either because more open firms may have better access to foreign finance or only unconstrained firms are able to exploit foreign markets.
Interestingly, when we split the sample by the two major periods, we find a reduction in constraints for open firms (columns 6 and 7), while the level of financial distress of closed firms remains mostly unchanged (columns 4 and 5).However, depending on the degree of openness, firms' financial constraints were either reduced (columns 10 and 11) or, if not equal (estimates in columns 8 and 9 are not statistically different), were amplified.This is a puzzling result since we would expect, a priori, that even though the reduction in constraints should be larger for highly open firms, firms with lower levels of openness should also exhibit a reduction in constraints, given that monetary integration should benefit mostly those firms that also have businesses overseas (through exchange rate stability and access to both foreign banks and financial markets).Additional differences arise between firms with low and high levels of openness with respect to the impacts of sales growth, investment and variation of interest paid.We also tested the inclusion of real GDP growth or unemployment, in order to capture possible influences of the economic cycle, nevertheless the results remain very similar.Results remain unchanged if we additionally control for the benchmark interest rate, number of employees or age or even if,  VARIABLES 1996VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004 (  1).Firms' openness score definition in Appendix.All regressions include two-digit industry dummies (CAE rev.2.1).Robust standard errors in parentheses.***, **, and * denote statistical significance at the .01,.05,and .10levels, respectively.Tables with confidence intervals and further test statistics available from the authors on request.Some of the statistics in this table were reported in Silva and Carreira (2011) instead of degree of openness-EU, we use total degree of openness. 19hese results indicate that while highly open firms benefited the most with the integration, closed firms experienced no changes with respect to constraints and, most interestingly, slightly open firms faced, if not the same, higher constraints in the second period.This odd result arises for firms that have very small degrees of openness-smaller than 0.5%, while for firms between 0.5% and 1% the results are as previously hypothesised. 20This might, however, be associated with larger competition for funds in the integrated markets, since firms with low degrees of openness might not be as visible abroad as they would be in the domestic market, while at the same time, losing their advantage on the domestic market, where lenders will then opt to finance domestic or even foreign firms with better prospects.In fact, if we compare the level of constraints of these firms with those of closed firms, the difference in CCFS estimates is larger for the initial period than for the second period.One could argue that lenders would no longer distinguish between slightly open and closed firms.
If instead we look at firm export and import activity separately, we see that firms with higher export or import intensities are less financially constrained, as expected, even though the pattern is clearer for the case of exports-while for exports (Table 4, columns 1-3) all estimates are statistically different, for the case of imports (Table 5, columns 1-3), high intensity estimates are not statistically different from those of lower intensity.
However, when we compare the levels of constraints before and after monetary integration, distinct patterns arise.While no significant differences between periods are found for firms that either imported or not (Table 5, columns 4-7), firms that either exported or not (Table 4, columns 4-7) seem to have experienced a slight reduction in constraints with integration (a formal Wald test only rejects that the coefficients are statistically equal at the 90% level).
Nevertheless, the levels of constraints for non-exporting firms in the second period is much larger than those of exporting firms in the first period (Table 4, columns 5 and 6, respectively). 21f we further distinguish between low and high levels of export and import intensities, we find a clear contrast between these firms.Whereas for high export intensity firms, financial constraints levels remain unchanged at low levels (estimates in columns 10 and 11 of Table 4 are not statistically different), high intensity importers experienced a clear reduction in constraints (Table 5, columns 10 and 11).These results suggest that firms that rely mostly on imports accrued larger benefits from integration than did export driven firms.This may arise because the former saw their credit conditions improved overseas, while the latter already benefited from a privileged position before integration, corroborated by the CCFS estimates for the first period (Table 5, column 10).Conversely, while there is a clear increase in financial constraints for firms with lower import intensities (Table 5, columns 8 and 9), the level of constraints for firms with low export intensity, if not lower, remains practically unchanged in the second period (Table 4, columns 8 and 9 report CCFS estimates that are not statistically different).This result clarifies the higher CCFS, after integration, found for firms with lower degree of openness, provided it is due to an higher contribution of importing firms rather than exporting ones.VARIABLES 1996VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004 (   VARIABLES 1996VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004VARIABLES 1996VARIABLES -2000VARIABLES 2001VARIABLES -2004 ( In order to verify if firms' constraints were actually reduced with shifting, there is no longer a point in analysing firm openness, since if a firm starts importing, even though there might be a constraints alleviating effect due to relationships established abroad, the opposite effect might be larger due to a possible necessity of importing goods (either machinery or raw materials) that boosts the demand for cash (this pattern is clear from the comparison of columns 5 and 6 in Table 6).However, if we look at firms that started exporting, it is clear that the self-selection effect (financial constraints barrier) is not as large as the benefits accruing from access to better finance either abroad or at home, as we can see from the comparison of the estimates from columns 4 and 5 (CCFS coefficients dropped from 0.265 to 0.145 and are statistically different).If instead estimates on CCFS before and after starting to export would be similar, then this would suggest that less constrained firms would self-select into exporting. 22These results are confirmed if, instead of splitting the sample, we interact cash-flow with a binary indicator for the shifting status-before and after shifting (Table A1 in appendix).Nevertheless, even after starting to export, these firms still face significant constraints as they save, on average, 15 cents out of each extra euro of cash-flow.Finally, the fact that, on average, firms before starting to export present high CCFS (they save 27 cents out of each euro of extra cash-flow), casts serious doubts on the hypothesis that only unconstrained firms self-select into exporting activity.1) with interaction terms for cash-flow and degree of openness, export intensity and import intensity (columns 1-3, respectively), as well as with a binary indicator for firms before and after shifting to export activity (column 4).All regressions include industry dummies (2-digit CAE rev.2.1).Robust standard errors in parentheses.***, **, and * denote statistical significance at the .01,.05,and .10levels, respectively.Tables with

Table 1a :
Summary Statistics Mean values and standard deviations, given in parentheses, of the main variables used in the estimations.Some of the statistics in this table were reported in

Table 1b :
Summary Statistics Mean values and standard deviations, given in parentheses, of the main variables used in the estimations.

Table 1c :
Spearman's rank correlation coefficients for the different periods

Table 2 :
CCFS estimation with different controls for money market

Table 3 :
CCFS estimation by openness towards the EU

Table 4 :
CCFS estimation by export intensity-EU Regression of equation (1).Firms' export intensity scores definition in Appendix.All regressions include two-digit industry dummies (CAE rev.2.1).Robust standard errors in parentheses.***, **, and * denote statistical significance at the .01,.05,and .10levels, respectively.Tables with confidence intervals and further test statistics available from the authors on request.

Table 5 :
CCFS estimation by import intensity-EU Regression of equation (1).Firms' import intensity scores definition in Appendix.All regressions include two-digit industry dummies (CAE rev.2.1).Robust standard errors in parentheses.***, **, and * denote statistical significance at the .01,.05,and .10levels, respectively.Tables with confidence intervals and further test statistics available from the authors on request.

Table 6 :
CCFS for shifting firms Regression of equation (1) for groups of firms that moved from closed to open, started exporting those that started importing.All regressions include two-digit industry dummies (CAE rev.2.1).Robust standard errors in parentheses.***, **, and * denote statistical significance at the .01,.05,and .10levels, respectively.Tables with confidence intervals and further test statistics available from the authors upon request

Table A1 :
Financial constraints, openness, exports and imports using interactions confidence intervals and further test statistics available from the authors upon request ESTUDOS DO G.E.M.F.Available on-line at http://gemf.fe.uc.pt) 2011-13 Financial constraints and exports: An analysis of Portuguese firms during the European monetary integration -Filipe Silva & Carlos Carreira 2011-12 Growth Rates Constrained by Internal and External Imbalances: a Demand Orientated Approach -Elias Soukiazis, Pedro Cerqueira & Micaela Antunes 2011-11 Inequality and Growth in Portugal: a time series analysis -João Sousa Andrade, Adelaide Duarte & Marta Simões 2011-10 Do financial Constraints Threat the Innovation Process?Evidence from Portuguese Firms -Filipe Silva & Carlos Carreira 2011-09 The State of Collective Bargaining and Worker Representation in Germany: The Erosion Continues -John T. Addison, Alex Bryson, Paulino Teixeira, André Pahnke & Lutz Bellmann 2011-08 From Goal Orientations to Employee Creativity and Performance: Evidence from Frontline Service Employees -Filipe Coelho & Carlos Sousa 2011-07 The Portuguese Business Cycle: Chronology and Duration Dependence -Vitor Castro 2011-06 Growth Performance in Portugal Since the 1960's: A Simultaneous Equation Approach with Cumulative Causation Characteristics -Elias Soukiazis & Micaela Antunes 2011-05 Heteroskedasticity Testing Through Comparison of Wald-Type Statistics -José Murteira, Esmeralda Ramalho & Joaquim Ramalho 2011-04 Accession to the European Union, Interest Rates and Indebtedness: Greece and Portugal -Pedro Bação & António Portugal Duarte 2011-03 Economic Voting in Portuguese Municipal Elections -Rodrigo Martins & Francisco José Veiga 2011-02 Application of a structural model to a wholesale electricity market: The Spanish market from January 1999 to June 2007 -Vítor Marques, Adelino Fortunato & Isabel Soares 2011-01 A Smoothed-Distribution Form of Nadaraya-Watson Estimation -Ralph W. Bailey & John T. Addison 2010-22 Business Survival in Portuguese Regions -Alcina Nunes & Elsa de Morais Sarmento 2010-21 A Closer Look at the World Business Cycle Synchronization -Pedro André Cerqueira 2010-20 Does Schumpeterian Creative Destruction Lead to Higher Productivity?The effects of firms' entry -Carlos Carreira & Paulino Teixeira 2010-19 How Do Central Banks React to Wealth Composition and Asset Prices?-Vítor Castro & Ricardo M. Sousa 2010-18 The duration of business cycle expansions and contractions: Are there change-points in duration dependence?-Vítor Castro 2010-17 Water Pricing and Social Equity in Portuguese Municipalities -Rita Martins, Carlota Quintal, Eduardo Barata & Luís Cruz 2010-16 Financial constraints: Are there differences between manufacturing and services?-Filipe Silva & Carlos Carreira 2010-15 Measuring firms' financial constraints: Evidence for Portugal through different approaches -Filipe Silva & Carlos Carreira 2009-09 Wage Dispersion in a Partially Unionized Labor Force -John T. Addison, Ralph W. Bailey & W. Stanley Siebert 2009-08 Employment and exchange rates: the role of openness and technology -Fernando Alexandre, Pedro Bação, João Cerejeira & Miguel Portela 2009-07 Channels of transmission of inequality to growth: A survey of the theory and evidence from a Portuguese perspective -Adelaide Duarte & Marta Simões 2009-06 No Deep Pockets: Some stylized results on firms' financial constraints -Filipe Silva & Carlos Carreira 2009-05 Aggregate and sector-specific exchange rate indexes for the Portuguese economy -Fernando Alexandre, Pedro Bação, João Cerejeira & Miguel Portela 2009-04 Rent Seeking at Plant Level: An Application of the Card-De La Rica Tenure Model to Workers in German Works Councils -John T. Addison, Paulino Teixeira & Thomas Zwick 2009-03 Unobserved Worker Ability, Firm Heterogeneity, and the Returns to Schooling and Training -Ana Sofia Lopes & Paulino Teixeira 2009-02 Worker Directors: A German Product that Didn't Export?-John T. Addison & Claus Schnabel 2009-01 Fiscal and Monetary Policies in a Keynesian Stock-flow Consistent Model -Edwin Le Heron A série Estudos do GEMF foi iniciada em 1996. (