Modelling the Extensive Margin of World Trade: New Evidence on GATT and WTO Membership

Recent literature has argued that, contrary to the results of a seminal paper by Rose (2004), General Agreement on Tariffs and Trade (GATT)/World Trade Organization (WTO) membership does promote bilateral trade, at least for developed economies and if membership includes non‐formal compliance. We review the literature to identify open issues. We then develop a simple extension of the gravity model that gives rise to an extensive country margin of trade separating positive trade from zero trade country pairs. The model is used to identify WTO membership effects at both the intensive and the extensive margins. Empirical estimation of this model, based on Poisson pseudo‐maximum likelihood methods with exporter and importer fixed effects, allows us to readdress the empirical issue of whether GATT/WTO membership does or does not promote trade. We find that GATT membership was successful on the extensive margin of world trade but not on the intensive margin. For the recent WTO episode (1995–2008), we find consistent and robust evidence for a substantial trade‐creating role of membership which is driven primarily by the intensive margin. WTO membership results in higher bilateral trade of about 40 per cent.     

The effect of the Uruguay round on the intensive and extensive margins of trade

Do tariffs inhibit trade flows by limiting the entry of exporters (‘firm extensive margin’) or by restricting the average volume exported by each firm (‘firm intensive margin’)? Using a gravity equation approach, we analyze how the decrease in tariffs promoted during the 90s by the Uruguay Round multilateral trade agreement affected the trade margins of French firms for 57 sectors and 147 countries from 1993 to 2002. Our main contribution is to estimate the elasticity of trade on both margins, controlling for the unobserved heterogeneity of trade flows thanks to a three-dimensional panel and to time-varying tariffs as a measure of variable trade costs. Our results show that the number of firms exporting in a given sector to a given destination is related to the level of tariffs. But they also show that the decrease in tariffs induced by the implementation of the Uruguay Round did not lead more firms to export and that it only induced incumbent exporters to increase their shipments. We control for two problems that may affect our basic specification: tariff changes may be endogenous and zero flows are not included. Our results are confirmed — even when the extensive margin is significant, its magnitude is very small.     

Trade barriers and trade flows with product heterogeneity: An application to US motion picture exports

We extend Melitz (2003) to allow for both global and bilateral fixed export costs. If global (bilateral) export costs dominate, the average sales ratio (import sales per product variety/domestic sales per variety), decreases (increases) in variable (fixed) trade barriers, due to adjustment along the intensive (extensive) margin of trade. Using novel data on bilateral US movie exports we find that (i) variation in box-office revenues per movie is much larger than in the number of movies exported, and (ii) the average sales ratio decreases in geographic and linguistic distance. These findings suggest that global fixed export costs dominate.     

In search of WTO trade effects: Preferential trade agreements promote trade strongly, but unevenly

The literature measuring the effects of WTO membership on trade flows has produced remarkably diverse results. Rose (2004) reports a wide range of empirical specifications that produce no WTO effects. Tomz et al. (2007) use Rose's data but include de facto WTO membership, to find positive WTO trade effects. Rose (2005) also produced positive WTO trade effects after accounting for the diverse trade effects produced by individual preferential trade agreements (PTAs). When Subramanian and Wei (2007) emphasize general equilibrium trade effects by controlling for multilateral resistance, they find strong WTO trade effects only for industrialized countries. Subramanian and Wei (2007), however, account neither for unobserved heterogeneity among trading partners, nor for differences in trade effects across PTAs (which could inflate WTO estimates). We unify the Rose, Tomz et al., and Subramanian and Wei specifications in one comprehensive approach that minimizes omitted variable bias to show that all specifications produce one consistent result: WTO effects on trade flows are not statistically significant, while PTAs produce strong but uneven trade effects. Extending the gravity model to address specific avenues in which WTO may have affected trade flows, we find that WTO membership boosts trade prior to PTA formation and increases trade among proximate developing countries (at the expense of distant trade). An augmented gravity model that accounts for WTO terms-of-trade theory shows that countries with greater incentives to bargain for tariff reductions before WTO accession experience positive and significant subsequent WTO trade effects.     

The gravity of financial development

The article empirically tests the link between financial constraints with the extensive (proportion of exporters) and the intensive (volume of exports) margins of international trade. The main contribution is the macroeconomic analysis of this relationship – i.e. the investigation of the effect of finance on trade of all economic sectors combined – which is further reaching than the manufactured-sector-based focus found in the current literature. The study is developed on the basis of a bilateral trade database on 104 countries between 1998 and 2007. The empirical section estimates a two-stage gravity equation using panel data and shows a positive impact of financial development on the marginal variation of the extensive margin. However, the estimate of the relationship between finance and the intensive margin shows an unexpected result. It finds inconsistent results demonstrating a relationship that is negative, positive or statistically null.     

The trade comovement puzzle and the margins of international trade

Countries that trade more with each other tend to have more strongly correlated business cycles. Yet, traditional international business cycle models predict a much weaker link between trade and business cycle comovement. We propose that fluctuations in the number of varieties embedded in trade flows may drive the observed comovement by increasing the correlation among trading partners' aggregate productivity. Our hypothesis is that business cycles should be more strongly correlated between countries that trade a wider variety of goods. We find empirical support for this hypothesis. After decomposing trade into its extensive and intensive margins, we find that the extensive margin explains most of the trade–productivity and trade–output comovement. This result is striking because the extensive margin accounts for only a fourth of the variability in total trade. We then develop a two-country model with heterogeneous firms, endogenous entry, and fixed export costs, in which the aggregate productivity correlation increases with trade in varieties. A numerical exercise shows that our proposed mechanism increases business cycle synchronization compared with the levels predicted by traditional models.     

Time Zone Effect and the Margins of Exports

The negative effect of time zone on trade flows has recently been established in the literature. However, thus far, no paper has explored the differing time zone effect on the intensive and extensive margin. Utilising product‐level trade data, this paper examines the impact of time zone differences on the intensive and extensive margin of exports. Furthermore, this paper examines the non‐linear impact of different levels of time zone differences on exports. Using the Poisson pseudo‐maximum likelihood estimation, the results indicate that the time zone differences negatively affect exports primarily via the extensive margin, with no effect on the intensive margin, which suggests that time zone differences act as a fixed cost of exporting. Furthermore, quartile analysis shows non‐linearities in the time zone measure, more specifically that time zones matter more at larger time zone differences. These results can have important policy implications for nations looking to increase their trade presence.     

French Firms' Exports During Downturns: Evidence from Past Crises

This paper makes use of detailed French firm‐level data on a quarterly basis to investigate the impact of past crises on exports and the margins of adjustment. We first detect crises periods using quantitative criteria and classify them into banking crises, currency crises, simultaneous banking and currency crises, and other crises. Our results underline the prevalence of the intensive margin of adjustment to large shocks, that is, firms reducing their average sales per product while staying on the market. The extensive margin of trade is, however, dominant in currency crises. On average, a crisis reduces the growth rate of exports over six quarters. Finally, we show that exports overreact to demand variations during crises, and that the extensive margin is more responsive to demand. Other factors, not directly related to demand, mostly affect the intensive margin.     

How Do Exporters React to Changes in Cost Competitiveness?

Various international institutions such as the European Commission, the ECB and the OECD often use unit labour costs as a measure of international competitiveness. The goal of this paper was to examine how well this measure is related to international export performance at the firm level. To this end, we use Belgian firm‐level data for the period 1999 to 2010 to analyse the impact of unit labour costs on exports. We find an estimated elasticity of the intensive margin of exports with respect to unit labour costs between −0.2 and −0.4. This elasticity varies between sectors and between firms, with more labour‐intensive firms having a higher elasticity. The microdata also enable us to analyse the impact of unit labour costs on the extensive margin. Our results show that higher unit labour costs reduce the probability of starting to export for non‐exporters and increase the probability of exporters stopping. While our results show that unit labour costs have an impact on the intensive margin and extensive margin of firm‐level exports, the effect is rather low, suggesting that pass‐through of costs into prices is limited. The latter is consistent with recent trade models emphasising that not only relative costs, but also demand factors such as quality and taste matter for explaining firm‐level exports.     

Governance and Globalisation

Unlike the large literature on ‘democracy and trade’, there is a much smaller literature on the effect of the level of democracy in a nation on the level of its foreign direct investment (FDI) inflow. These few studies reveal mixed empirical results, and surprisingly only one study has examined bilateral FDI flows. Moreover, few of these studies use multiple governance indicators separating the ‘pluralism’ effect of democratic institutions from the ‘good governance’ effect, there are no studies on democratic institutions’ various effects on the level of FDI relative to trade, and there are no studies of democratic institutions’ various effects on the selection of countries into FDI. We focus on three contributions. First, we examine the simultaneous effects of the World Bank's (six) Worldwide Governance Indicators (WGIs) – which allow separating the effects of pluralism from those of five other good governance measures – on bilateral trade, FDI and FDI relative to trade using state‐of‐the‐art gravity specifications. Second, we find strong evidence that – after accounting for host governments’ effectiveness in various roles of good governance – a higher level of pluralism as measured by the WGIs’ Voice and Accountability Index reduces trade levels, likely by increasing the ‘voice’ of more protectionist less‐skilled workers, but not FDI levels. Moreover, we find qualitatively different effects of other WGIs – such as political stability – on trade versus FDI flows. Third, we account for firm heterogeneity alongside a large number of zeros in bilateral FDI flows using recent advances in gravity modelling. We distinguish between the (country) intensive and extensive margins and show that pluralism affects FDI inflows negatively at the intensive margin, but positively at the extensive margin.     

The Extensive and Intensive Margins of Exports: The Role of Innovation

An important prediction of trade theories is that innovation can improve a country’s export performance. Using data on patents granted by the US as a proxy for innovation and data on manufacturing exports from 105 countries over the period 1975–2001, I investigate the extent to which innovation increases the number of products traded (the extensive margin) and the export value of each product (the intensive margin). The empirical results show that (i) innovation has a positive and significant effect on both the extensive and intensive margins. The intensive margin contributes 70 per cent of the effect, and the extensive margin accounts for 30 per cent. (ii) The effect of innovation on exports is stronger for low‐income countries than for high‐income countries. (iii) More innovative countries export greater quantities and charge higher prices, suggesting that innovation increases the product quality of exports.     

Trade Growth in a Heterogeneous Firm Model: Evidence from South Eastern Europe

In 2007 a free trade area (BFTA) will be created in the Balkans. In this paper we study BFTA‐induced trade growth in the SEE. Given that welfare impacts associated with trade growth depend on the growth channels, more goods and varieties exported or at higher price or more volume of exported goods and varieties, we study the structure of integration‐induced export growth in the Balkans. Given that no firm‐level trade data is available for the Balkans, we adopt the heterogeneous firm framework, which allows to decompose aggregate trade growth into intensive margin of trade and extensive margin of trade using only aggregate trade data. Our empirical findings predict that the BFTA would primarily increase the export volume through a growing number of shipments (the extensive margin of trade) suggesting that the actual welfare gains from the trade growth in the Balkans might in fact be larger than predicted in previous trade studies. We also found that reducing variable trade costs leads to higher export growth rates compared to reducing fixed trade costs by the same percentage.     

Heterogeneous firms,exporter networks and the effect of distance on international trade

Distance effects in gravity equations are high and are not decreasing over time. Given that technical change in transport technology is biased in favor of long distances, this constitutes a challenge for existing theoretical models. In line with recent empirical evidence, this paper introduces a spillover effect from the number of exporters to the fixed costs of exporting into a trade model with heterogeneous firms. Since less firms export to remote markets, the equilibrium fixed costs are increasing in distance. This creates an additional effect of distance on aggregate trade flows: while the intensive margin of trade is unaffected, the extensive margin is magnified. This magnification leads to higher predicted distance effects. In addition, it offers a new perspective on non-decreasing distance effects: a relatively moderate strengthening of the spillover over time is sufficient to generate a constant distance elasticity.     

Trade facilitation and the extensive margin

The literature on trade facilitation has mostly focused on implications for trade volumes. However, recent theoretical contributions have emphasized that trade costs – such as transaction costs related to cross-border trade procedures – affect both the traded volumes of ‘old’ goods (the intensive margin) and the range of traded goods (the extensive margin). This article therefore tests whether trade facilitation affects the extensive margin by counting the number of 8-digit products that are exported from developing to EU countries, and using this as the dependent variable in an estimation. Moreover, it also tests whether the extensive margins in differentiated and homogeneous goods are affected in the same way by transaction costs. Estimation results suggest that if export transaction costs – proxied by the number of days needed to export a good – declined by 1%, the number of exported differentiated and homogeneous products would rise by 0.6% and 0.3%, respectively. Policy simulations further illustrate that if all countries were as efficient at the border as the most efficient country at the same level of development, the number of exported differentiated and homogeneous products would increase by 62% and 26%, respectively.     

Bonus vetus OLS: A simple method for approximating international trade-cost effects using the gravity equation

Using a Taylor-series expansion, we solve for a simple reduced-form gravity equation revealing a transparent theoretical relationship among bilateral trade flows, incomes, and trade costs, based upon the model in Anderson and van Wincoop [Anderson, James E., and van Wincoop, Eric. “Gravity with Gravitas: A Solution to the Border Puzzle.” American Economic Review 93, no. 1 (March 2003): 170-192.]. Monte Carlo results support that virtually identical coefficient estimates are obtained easily by estimating the reduced-form gravity equation including theoretically-motivated exogenous multilateral resistance terms. We show our methodology generalizes to many settings and delineate the economic conditions under which our approach works well for computing comparative statics and under which it does not.     

Trade,Migration and Integration – Evidence and Policy Implications

This paper takes as its point of departure the unique position recently adopted by Swedish policymakers emphasising migration as a tool to increase trade. We attempt to empirically scrutinise this position. Our results demonstrate that migrants stimulate exports, especially along the extensive product margin of trade and for differentiated products, but have no significant impact on imports. This finding suggests that for small open economies where numerous immigrants are refugees, the strategy of using migration to facilitate trade may only be effective with respect to exports. This paper also contributes to the literature on trade and migration by exploiting data on gender and age, which allow us to draw inferences on the underlying impact channels. We adopt an instrumental variable approach to address the endogeneity issue due to potential reverse causality. The pattern of results is consistent with the hypothesis that migration primarily reduces fixed trade costs resulting from information and trust friction across migrant host and source countries. Importantly, the results imply that policymakers may be able to promote trade by improving immigrants’ labour market integration instead of simply being restricted to promoting more liberal immigration policies, which is generally more controversial.     

A global analysis of factors impacting the intensive and extensive margins of bilateral foreign direct investment

This study investigates determinants of bilateral foreign direct investment (FDI) on both margins, the extensive margin (whether to invest) and the intensive margin (how much to invest), based on the recent structural gravity model for FDI developed by Anderson et al. (Trade and investment in the global economy. National Bureau of Economic Research, Cambridge, MA, 2017). I examine a global data set comprised of 110 countries over 9 years, 2004–12. Apart from conventional gravity variables, the source country's technology capital shows a significant and positive impact on both FDI margins. Bilateral investment treaties play a significant role only in determining the extensive margin. Results on FDI stocks and FDI flows can lead to different conclusions; thus, research should consult both types of data series to find which variables have robust effects. Furthermore, breaking down the sample by country development levels reveals that FDI from less‐developed countries (LDCs) is not affected by many common variables, and thus, there is a need to develop more theories and empirical work to investigate the FDI from LDCs in particular.     

The WTO promotes trade, strongly but unevenly

This paper furnishes robust evidence that the WTO has had a strong positive impact on trade, amounting to about 120% of additional world trade (or US$ 8 trillion in 2000 alone). The impact has, however, been uneven. This, in many ways, is consistent with theoretical models of the GATT/WTO. The theory suggests that the impact of a country's membership in the GATT/WTO depends on what the country does with its membership, with whom it negotiates, and which products the negotiation covers. Using a properly specified gravity model, we find evidence broadly consistent with these predictions. First, industrial countries that participated more actively than developing countries in reciprocal trade negotiations witnessed a large increase in trade. Second, bilateral trade was greater when both partners undertook liberalization than when only one partner did. Third, sectors that did not witness liberalization did not see an increase in trade.     

Port efficiency and Brazilian exports: A quantitative assessment of the impact of turnaround time

This paper estimates the impact of vessels turnaround time on Brazilian exports. To achieve this goal, we use a difference gravity equation in order to explore the time variation in port procedures for 16 Brazilian ports. This paper uses a unique database with local exports, taking into account the port used and products aggregated at the four‐digit Harmonized System (HS ) level for the period between 2010 and 2012. The estimation results indicate that, in general, each additional hour of delay in port procedures represents costs to Brazilian exporters, which may lead to loss of competitiveness of domestic products abroad. According to the estimates, each additional relative hour of delay in the average port is equivalent to a reduction in relative local exports of ~2%. Moreover, a 10% relative reduction in vessel turnaround time can increase the proportional number of exported product categories by 1%. Therefore, our findings suggest that turnaround time has a statistically significant effect on the intensive and extensive margins of international trade.     

Intensive and extensive margins of exports: What can India learn from China?

We decompose India's export performance in manufactured products during 2000–15 into changes at the intensive and extensive margins. India's performance, along different margins, is compared and contrasted with that of China. The results show that while China outperforms India at both the margins, the gap is particularly wide at the intensive margin. Decomposition of intensive margin along quantity and price margins shows that Chinese products are generally sold cheaper than Indian products. Higher price margin, however, has not translated into high intensive margin for India due to its abysmally low quantity margin. We examine different explanations for China's superior performance relative to India, along different margins, using a gravity model. Our results suggest that China's exchange rate policy was not the prime reason for its export success. Neither do we find that FDI inflows were significant in explaining the export performance gap between them. The results show that China's export relationship bias towards high‐income partner countries holds the key in understanding its superior performance. This bias is a natural consequence of China's high degree of specialization in labor‐intensive activities. India, by contrast, due to an idiosyncratic pattern of specialisation, has failed to exploit its export potential in high income countries.