Shang-Jin Wei

Trading blocs and the Americas: The natural, the unnatural, and the super-natural

Abstract Is world trade becoming more regionalized, as a result of preferential arrangements such as NAFTA, the Andean Pact and MERCOSUR? If so, is this deviation from the principle of MFN (non-discriminatory trade policies) good or bad? This paper attempts to answer both questions. Using the gravity model to examine bilateral trade patterns throughout the world, we find evidence of trading blocs in the Western Hemisphere and elsewhere, as in earlier work. Intra-regional trade is greater than could be explained by natural determinants: the proximity of a pair of countries, their sizes and GNP/capitas, and whether they share a common border or a common language. Within the Western Hemisphere, MERCOSUR and the Andean Pact countries appear to function as significantly independent trading areas, but NAFTA much less so (as of 1990). The intra-regional trade bias within MERCOSUR increased the most rapidly during the 1980s. In East Asia, on the other hand, increased intra-regional trade can be explained entirely by the rapid growth of the economies. We then turn from the econometrics to an analysis of economic welfare. Krugman has supplied an argument against a world of three trading blocs (that they would be protectionist), in a model that assumes no transport costs. He has supplied another argument in favor of trading blocs, provided the blocs are drawn along ‘natural’ geographic lines, in a model that assumes prohibitively high transportation costs between continents. In this paper we attempt to resolve the Krugman vs. Krugman debate. We complete the model of the welfare implications of trading blocs for the realistic case where inter-continental transport costs are neither so high as to be prohibitive nor zero. We consider three applications of the model. 1. Continental Free Trade Areas (FTAs). We show that it is not only Krugmans ‘unnatural’ FTAs that can leave everyone worse off than under MFN, but that under conditions of relatively low inter-continental transport costs, FTAs that are formed along natural continental lines can do so as well. We call such welfare-reducing blocs super-natural . 2. Partial regionalization. We find that partial liberalization within a regional Preferential Trading Arrangement (PTA) is better than 100 percent liberalization. In the super-natural zone the regional trading arrangement, in contrast to the Article 24 provision of the GATT, reduces welfare. It occurs for combinations of low inter-continental transport costs and high intra-bloc preferences, i.e., when the regionalization of trade policy exceeds what is justified by natural factors. 3. The formation of several sub-regional PTAs on each continent. We find that multiple FTAs on each continent could lower welfare, but that multiple PTAs, with partial internal liberalization, would raise welfare. We conclude the paper with an attempt to extract estimates of transportation costs from the statistics. Estimates suggest that trading blocs on the order of the EC are in fact super-natural.

Convergence to the Law of One Price Without Trade Barriers or Currency Fluctuations

Using a panel of 51 prices from 48 cities in the United States we provide an upper bound estimate of the rate of convergence to Purchasing Power Parity. We find convergence rates substantially higher than typically found in cross-country data. We investigate some potentially serious biases induced by i.i.d. measurement errors in the data, and find our estimates to be robust to these potential biases. We also present evidence that convergence occurs faster for larger price differences. Finally, we find that rates of convergence are slower for cities farther apart. However, our estimates suggest that distance alone can only account for a small portion of the much slower convergence rates across national borders.

Foreign Portfolio Investors Before and during a Crisis

Using a unique data set, we study the trading behavior of foreign portfolio investors in Korea before and during the currency crisis. Different categories of investors have significant differences as well as similarities. First, non-resident institutional investors are always positive feedback traders, whereas resident investors before the crisis were negative feedback (contrarian) traders but switch to be positive feedback traders during the crisis. Second, individual investors herd significantly more than institutional investors. Non-resident (institutional as well individual) investors herd significantly more than their resident counterparts. Third, differences in the Western and Korean news coverage are correlated with differences in net selling by non-resident investors relative to resident investors.

The Composition Matters: Capital Inflows and Liquidity Crunch During a Global Economic Crisis

This paper studies whether the volume and composition of capital flows affect the degree of credit crunch during the 2007-2009 crisis. Using data on 3823 firms in 24 emerging countries, we find that, on average, the decline in stock prices was more severe for firms that are intrinsically more dependent on external finance for working capital. Interestingly, while the volume of capital flows per se has no significant effect, the composition matters a lot. In particularly, greater dependence on non-FDI capital inflows before the crisis worsens the credit crunch during the crisis, while exposure to FDI alleviates the liquidity constraint.

Give Credit Where Credit is Due: Tracing Value Added in Global Production Chains

This paper provides both a conceptual framework for decomposing a countrys gross exports into value-added components by source and a new bilateral database on value-added trade. Our parsimonious framework integrates all previous measures of vertical specialization and value-added trade in the literature. To illustrate the potential of the decomposition, we present a number of applications including re-computing revealed comparative advantages and constructing an index to describe whether a country-sector is likely in the upstream or downstream of global production chains.

Corruption and cross-border investment in emerging markets: Firm-level evidence

This paper studies the joint impact of corruption on the entry mode and volume of inward foreign direct investment (FDI) using a unique firm-level data set. We find that corruption not only reduces inward FDI, but also shifts the ownership structure towards joint ventures. The latter finding supports the view that corruption increases the value of using a local partner to cut through the bureaucratic maze. However, R&D intensive firms are found to favor sole ownership.

Service Offshoring and Productivity: Evidence from the US

The practice of sourcing service inputs from overseas suppliers has been growing in response to new technologies that have made it possible to trade in some business and computing services that were previously considered non-tradable. This paper estimates the effects of offshoring on productivity in US manufacturing industries between 1992 and 2000. It finds that service offshoring has a significant positive effect on productivity in the United States, accounting for around 10 per cent of labour productivity growth during this period. Offshoring material inputs also have a positive effect on productivity, but the magnitude is smaller accounting for approximately 5 per cent of productivity growth.

A New Look at Exchange Rate Volatility and Trade Flows

The effect of exchange rate volatility on trade flows was examined by a 1984 IMF study on G-7 countries. Over the past two decades, many developments in the world economy, such as the currency crises in the 1990s and increasing cross-border capital flows, may have exacerbated exchange rate volatility, while others, such as a deepening of the market in foreign exchange hedging instruments, may have reduced the impact of volatility on trade flows. Using recent advances in the economic theories on trade and in statistical methodologies, this paper revisits this important issue by taking into account these new developments and examining their effects on developing and transition economies, as well as on developed countries.

Gradualism versus Big Bang: Speed and Sustainability of Reforms

A beneficial reform may be blocked by a majority if it is implemented by a big bang but the same reform may succeed with an optimally designed gradualist approach. A gradualist approach can sometimes split opposition force and is, in this sense, more politically sustainable. On the other hand, if both approaches are politically preferred to no reform, a big bang is often preferred to gradualism in terms of both political support as well as economic efficiency.

''The bigger they are, the harder they fall'': Retail price differences across U.S. cities

This paper examines the evidence for nonlinear price behavior in retail goods prices across U.S. cities. First, a simple continuous-time model is used to explore the types of price behavior that can arise in the presence of market frictions. These frictions could be interpreted as transport costs, but we prefer a broader interpretation in which the frictions operate at the level of technology and preferences. Second, we gather price data from 24 U.S. cities on individual goods like orange juice and toothpaste. The empirical analysis reveals that price discrepancies between U.S. cities are stationary and nonlinearly mean-reverting to price parity.