Exchange rate uncertainty and US bilateral fresh fruit and fresh vegetable trade: an application of the gravity model

In order to analyse the effect of exchange rate uncertainty, we apply an empirical gravity equation to two sets of US bilateral trade data: fresh fruit over the period 1976–1999 for a panel of 26 countries; and fresh vegetables over the period 1976–2006 for a panel of nine countries. Based on panel estimation methods, and using both a moving SD measure and the Perée and Steinherr (1989) measure of exchange rate uncertainty, the results show that US bilateral fresh fruit trade has been negatively affected by exchange rate uncertainty. We also find some evidence that the exchange rate between the US dollar and the currencies of Latin American trading partners accounts for most of the negative impact of exchange rate uncertainty on bilateral trade flows in fresh fruit. In contrast, when using panel estimation methods and both measures of exchange rate uncertainty, we find no statistically significant evidence for any negative effect of exchange rate uncertainty on US bilateral fresh vegetable trade. However, we do find a statistically significant negative effect for exchange rate uncertainty when we estimate a US export gravity equation for fresh vegetables using the same panel of countries.     

Estimating gravity equations: to log or not to log?

In this study we compare the traditional OLS approach applied to the log-linear form of the gravity model with the Poisson Quasi Maximum Likelihood (PQML) estimation procedure applied to the non-linear multiplicative specification of the gravity model. We use the trade flows for all products, for all manufacturing products as well as for manufacturing products broken down by three-digit ISIC Rev.2 categories. We base our conclusions on the gravity model of Bergstrand (Rev Econ Stat 71(1):143--153, 1989) for disaggregate trade flows that allows us to investigate differences in factor-proportions and home-market effects at the industry level. In addition, we compare the effects of other explanatory variables such as exporter and importer total income, distance, preferential trade agreements, common border, historical ties, and common language on the volume of trade. Our main conclusion is that both estimation results as well as results of the regression mis-specification tests provide supporting evidence for the PQML estimation approach over the OLS estimation method. The paper has benefited from comments by an anonymous referee and by the participants at the following conferences: the 4th Nordic Econometrics Meeting, Tartu, Estonia, the 8th Annual Conference of the European Trade Study Group (ETSG), Vienna, Austria, the 21th Annual Congress of the European Economic Association (EEA), Vienna, Austria, the XIth Spring Meeting of Young Economists (SMYE), Sevilla, Spain, and the 5th Annual Conference of the European Economics and Finance Society (EEFS), Heraklion, Greece.     

Exploring the impact of economic integration agreements through extreme bounds analysis

This article provides an empirical strategy guided by the data to estimate the effects of Economic Integration Agreements (EIAs) on trade flows and their transitional dynamics. The strategy uses Extreme Bounds Analysis (EBA) to guide the choice of lags and leads in the effects without researchers' discretion involved. We show that arbitrarily selected year intervals and starting year can result in non-robust estimates of transitional dynamics of the effects of EIAs on trade flows. The empirical strategy follows two steps: EBA first sifts lags and leads of EIAs robustly related to trade flows from candidates, then these are included in the gravity equation to estimate the effects of EIAs on trade. We find that various lags and leads are robustly and positively related to trade flows, and the lag and lead structure depends on the level of integration. Our results show that EIAs have a long-term effect of 63% on trade flows. Under the richer lag and lead structure, deep-integration agreements beyond the level of free trade agreements have a much higher impact on trade flows than free trade agreements do (132% vs 31%). The estimates of effects of EIAs obtained from EBA-based estimation have a smaller contemporaneous effect and larger phased-in effects compared to previous studies relying on the subjective choices of year intervals while similar results are observed with the decomposed EIAs.     

Regional Integration Agreements,Trade Flows and Economic Crisis: A Static and Dynamic Gravity Model

Regional trade agreements (RTA) strengthening is a crucial component of the contemporary global economy. These agreements are considered beneficial in many senses (economics: trade, FDI, growth, etc.) and are a stabilizing factor in international relations (politics). In this paper, I study the effects of RTAs on exports between members and non-members taking into account the Viner specification. I also try to estimate the effect of the recent economic crisis on the export flows and achievement of RTAs. I use a static and dynamic gravity model to 40 countries belonging to 6 heterogeneous RTAs for the period 1980–2011. This model is estimated taking into account the latest estimation techniques that treats endogeneity effects of integration and the existence of dynamic effect.     

International student migration to Germany

The past decades have witnessed an impressive growth of international student mobility. This article presents first empirical evidence on international student migration to Germany, one of the most important destination countries for international students worldwide. While previous research in the field has mainly used data on international trade in educational services, I use a novel approach that analyzes student mobility as a form of migration, using data on international student migrants. An augmented gravity equation is the basis for the theoretical and empirical framework. I also provide extensive sensitivity checks of the empirical results and estimates using both the usual log-linearized and a multiplicative specification of the gravity equation, following recent work by Santos Silva and Tenreyro (Rev Econ Stat 88(4): 641–658, 2006). The results provide evidence for the importance of distance—a familiar result from the empirical migration literature. Unlike for international migration on the whole, the importance of disposable income in the home country does not seem to be too big for students, and student migrant flows from politically unfree countries are significantly lower.     

DOES THE GRAVITY MODEL EXPLAIN SOUTH KOREA'S TRADE FLOWS?*

This paper applies the gravity model to explain South Korea's bilateral trade flows and to extract practical trade policy applications. A trade structure and an Asian‐Pacific trade network are included in the gravity equation to characterize the peculiarity of South Korea's trade patterns. The empirical result shows that South Korea's trade follows a Heckscher–Ohlin model more than an increasing returns or a product differentiation model. South Korea has large unrealized trade potentials with Japan and China, suggesting that they are desirable partners for an FTA. North–South Korean trade will expand markedly if bilateral relation normalizes and North Korea participates in APEC.     

Which commercial partners are important for the most recently admitted EU countries?

This paper describes the degree of trade integration inside the European Union (EU) after the fifth enlargement in 2004. To achieve this goal, we build a database of information on trade flows between the new EU countries (EU‐10) and 180 commercial partners in six different sectors from 1999 to 2011. Using the standard gravity model and estimating a difference‐in‐differences specification, we analyze how joining the EU affected the intensity and direction of the EU‐10's trade flows. Our results show that though trade exchanges between the EU‐10 and EU‐15 intensified after 2004, the impact of integration was much more significant to the EU‐10 group.     

GATT/WTO Promotes Trade Strongly: Sample Selection and Model Specification

Some recent empirical studies examine the impact of the GATT/WTO on trade. This paper investigates the sample selection bias and the gravity model specification issues in the literature. First, the GATT/WTO not only makes existing trading partners trade more at the intensive margin, but also creates new trading relationships at the extensive margin. Most existing papers exclude zero trade observations and hence ignore the extensive margin. Secondly, due to the violation of some maintained assumptions, the traditional log-linear gravity regressions fail to uncover the role of the GATT/WTO even at the intensive margin. Using a large bilateral panel dataset including zero trade flows and a more appropriate econometric method, this paper finds that the GATT/WTO has been very effective in promoting world trade at both the intensive and extensive margins.     

Trade frictions and welfare in the gravity model: how much of the iceberg melts?

Abstract.  A key element missing from the structural gravity literature is an examination of the implied general equilibrium. By design the gravity equation is adept at predicting bilateral trade flows. To make inferences beyond trade flows, however, the theoretic models should be consistent with other observables. Structural econometric estimates from Anderson and van Wincoop (2003) allow us to evaluate their proposed general equilibrium along several dimensions. We find that their gravity model predicts too large a difference between consumer and producer prices; excessive variation in the geographic distribution of consumer price indices; and an exceptionally large portion of output devoted to overcoming trade frictions. Under plausible parameterizations of the model at least 50% of output 'melts' in transit. JEL classification: F10     

How did wars dampen trade in the MENA region?

The article investigates the impact of wars on trade in the Middle East and North African region. Using an augmented gravity model that controls for the endogeneity problem in our estimation, we introduce a war variable and distinguish between different types of conflicts. The results show that wars have a significantly negative impact on exports, imports and trade. Civil conflicts hinder exports, imports and trade significantly. The disaggregated version of the gravity model shows that non-state conflicts have a detrimental effect on bilateral trade flows in manufacturing, and that none of the conflicts do affect trade in services. We also find that, on average, a conflict is equivalent to a tariff of 5% of the value of trade.     

Do state borders matter for U.S. intranational trade? The role of history and internal migration

Abstract.  Empirical evidence of the impact of borders on international trade flows using the gravity equation approach abounds. This paper examines the empirical relevance of state borders in U.S. interstate trade for various specifications of the gravity equation. We find a large and economically significant subnational border effect for some specifications. However, two model specifications drastically reduce (if not eliminate) the border effect: (i) dynamic panel specifications controlling for past levels of trade and (ii) models conditioning on internal migration.     

National borders matter … where one draws the lines too

Abstract The fact that crossing a political border dramatically reduces trade flows has been widely documented in the literature. The increasing number of borders has surprisingly attracted much less attention. The number of independent countries has indeed risen from 72 in 1948 to 192 today. This paper estimates the effect of political disintegration since World War II on the measured growth in world trade. We first show that trade statistics should be considered carefully when assessing globalization over time, since the definition of trade partners varies over time. We document a sizeable resulting accounting artefact, which accounts for 17% of world trade in 2007. Second, based on a structural gravity equation, we estimate that since World War II political disintegration alone has raised measured international trade flows by 7% but decreased actual trade flows (including inter‐regional trade) by 2%.     

The effect of the Kyoto Protocol on international trade flows: evidence from G20 countries

This study examines the effect of the Kyoto Protocol on trade using gravity model with a Quandt–Andrews test for detection of structural break with G20 countries data. The structural break on international trade took place in 2003 that is around 1 year after the adoption of the Marrakesh Accords which includes the detailed implementation rules of the Kyoto Protocol. According to estimation results, this study can support the negative effect of environmental regulations on trade flows.     

The impact of oil prices on trade

This paper introduces an oil price–distance interaction variable in a gravity equation to explain how global trade behaves as a result of oil price changes. The findings are that as oil prices increase, international trade becomes more localized in that countries begin trading relatively more with their neighbors. In contrast, when they decrease, trade becomes more dispersed in that the distance between countries becomes less relevant. These results are highly significant across specifications, and the magnitude is not to be ignored. According to the full specification an oil price halving will make trade more dispersed by relatively increasing trade by 40% for a distance of 10,000 miles and by 25% for a distance of 1,000 miles.     

Exports,investment and policy uncertainty

Building on a literature that underscores the value of delaying investment in the face of uncertainty, we study how policy uncertainty in 18 large economies affects exports to these economies. We decompose aggregate bilateral trade flows from 1995 to 2013 into intensive and extensive margin components and employ a gravity specification to assess the impact of policy uncertainty on each margin separately. Consistent with theory, increases in policy uncertainty decrease both trade values and the extensive margin but, if anything, increase the intensive margin. In further tests, we use various proxies for sunk export costs and demonstrate that the effects of policy uncertainty are more pronounced where sunk costs are higher.     

The gravity model analysis: an application on MERCOSUR trade flows

This paper explores the determinants of bilateral trade flows between Mercosur countries. To this aim, a gravity model is applied to annual bilateral exports between 75 countries in 1980–2008. The model is augmented with variables that are relevant in determining the volume and direction of international trade using two alternative estimation methods; pooled ordinary least squares and panel fixed effects. The results reveal that the influence of the agreement on trade has been positive but moderate. As a whole, Mercosur has had positive effects, and this agreement can be reinforced with the deepening of their relationships and the entry of new members.     

The effect of free trade agreements revisited: Does residual trade cost bias matter?

This paper revisits a prominent gravity model‐based empirical literature on the effects of free trade agreements by accounting for a potential bias caused by unobservable trade costs that operate through general equilibrium constraints. It embeds state‐of‐the‐art panel estimation techniques in a recently proposed two‐step remedy that features a constrained ANOVA‐type estimation. Using a dataset on manufacturing trade flows in eight sectors in 40 countries and a rest‐of‐the‐world aggregate for the period 1990–2002, it finds evidence of significant residual trade cost bias. The direction and magnitude of bias vary across sectors, with the standard one‐step approach used in the literature overestimating or underestimating the partial effect of free trade agreements by up to 110 percent. Overall, coefficients on trade costs variables are jointly significantly different between the standard method and the two‐step method. The biases in partial effect estimates translate into biases in general equilibrium effects.     

Estimating the effects of non‐discriminatory trade policies within structural gravity models

We propose a simple method to identify the effects of unilateral and non‐discriminatory trade policies on bilateral trade within a theoretically consistent empirical gravity model. Specifically, we argue that structural gravity estimations should be performed with data that include not only international trade flows but also intra‐national trade flows. The use of intra‐national sales allows identification of the effects of non‐discriminatory trade policies such as most favoured nation tariffs, even in the presence of exporter and importer fixed effects. A byproduct of our approach is that it can be used to recover estimates of the trade elasticity, a key parameter for quantitative trade models. We demonstrate the effectiveness of our techniques in the case of most favoured nation tariffs and “time to export” as representative non‐discriminatory determinants of trade on the importer and on the exporter side, respectively. Our methods can be extended to quantify the impact on trade of any country‐specific characteristics as well as any non‐trade policies.     

International migration and trade agreements: The new role of PTAs

This paper provides an empirical analysis of the relationship between preferential trade agreements (PTAs) and bilateral migration flows. Building on the empirical literature on the determinants of migration flows, I estimate a modified gravity model to assess the role of PTAs and their content on bilateral migration flows. Using a sample of 29 OECD destination countries over the period 1998–2008, I show a strong positive effect of PTAs on bilateral migration flows. I find that the content of PTAs also matters: when visa‐and‐asylum and labour market related provisions are included in PTAs, this further stimulates bilateral migration flows. Different estimation strategies, including instrumental variables, are employed to address the potential endogeneity bias problems related to PTAs and their content.     

The trade impact of European Union agricultural preferences

We assess the impact on agricultural trade of European Union (EU) trade policies, using a gravity model based on disaggregated trade flows from 161 developing countries (DCs) to 15 EU member countries. We use a sample selection framework to account for potential selection bias of positive trade flows and provide an explicit measure for relative preference margins. From a policy perspective, our results debunk some of the most widespread criticisms of preferential policies: EU preferences matter and have a positive impact on DCs agricultural exports at both the extensive and intensive margins, although with significant differences across sectors.