Jean Imbs

Trade, Finance, Specialization, and Synchronization

I investigate the determinants of business cycles synchronization across regions. I use both international and intranational data to evaluate the linkages between trade in goods, trade in financial assets, specialization and business cycles synchronization in the context of a system of simultaneous equations. In all specifications, the results are as follows. (i) Simultaneity is important, as both trade and financial openness have a direct and an indirect effect on cycles of synchronization. (ii) A variety of alternative measures of financial integration suggest that economic regions with strong financial links are significantly more synchronized, even though they are also more specialized. (iii) Specialization patterns have a sizeable effect on business cycles, above and beyond their reflection of intra-industry trade and of openness to goods and assets trade. (iv) The simultaneous approach makes it possible to disentangle the impacts of both inter- and intra-industry trades. The estimated role of trade is in line with existing models once intra-industry trade is controlled for. Furthermore, trade-induced specialization has virtually no effect on cycles synchronization. The results obtain in a variety of datasets, measurement strategies and specifications. They relate to a recent strand of International Business Cycles models with incomplete markets and transport costs, and on the empirical side, point to an important omission in the list of criteria defining an Optimal Currency Area, namely specialization patterns.

PPP Strikes Back: Aggregation And the Real Exchange Rate

Internet, voice calls, and messaging services have become ubiquitous and the means by which the services are accessed varies widely. The number and types of devices that may use these services have also proliferated. To serve a number and variety of client devices, a mobile Hotspot may be used, which is a device that may include a modem for mobile broadband access and a short range wireless link to distribute the services to local devices which may have such connectivity. Power consumption of battery powered client devices is an important consideration. A method and apparatus are disclosed that enable a client device to receive paging information from the mobile networks through a mobile Hotspot over a short range wireless link which may reduce power consumption of client devices.

Credit Supply and the Price of Housing

An exogenous expansion in mortgage credit has significant effects on house prices. This finding is established using US branching deregulations between 1994 and 2005 as instruments for credit. Credit increases for deregulated banks, but not in placebo samples. Such differential responses rule out demand-based explanations, and identify an exogenous credit supply shock. Because of geographic diversification, treated banks expand credit: housing demand increases, house prices rise, but to a lesser extent in areas with elastic housing supply, where the housing stock increases instead. In an instrumental variable sense, house prices are well explained by the credit expansion induced by deregulation.

Growth and Volatility

Growth and volatility correlate negatively across countries, but positively across sectors. Analytically, whether or not sectoral growth and volatility are correlated positively is irrelevant in the aggregate. Cross-country estimates identify the detrimental effects of macroeconomic volatility on growth, but they cannot be used to dismiss theories implying a positive growth-volatility coefficient, which appear to hold in sectoral data. In particular, volatile sectors command high investment rates, as they would in a mean-variance framework.

Competition, Globalization, and the Decline of Inflation

We investigate theoretically and empirically the competitive effects of increased trade on prices, productivity and markups. Using disaggregated data for EU manufacturing over the period 1988-2000 we find increased openness exerts a negative and significant impact on sectoral prices. Increased openness lowers prices by both reducing markups and raising productivity. In response to an increase in openness, markups show a steep short run decline, which partly reverses later, while productivity rises in a manner that increases over time. Our estimates suggest that EU manufacturing prices fell by 2.3%, productivity rose by 11% and markups fell by 1.6% in response to the observed increase in manufacturing imports. The direct price restraint caused by greater imports, assuming unchanged monetary policy, can explain a fall in inflation of up to 0.14% per annum. The most substantial impact on inflation arises, however, from the role of lower markups in reducing the inflation bias of monetary policy. Our results suggest that increased trade could account for as much as a quarter of European disinflation over this period.

Nonlinearities and real exchange rate dynamics

We confirm the presence of substantial nonlinearities in real exchange rate dynamics at the sectoral level. There exists zones where arbitrage is not profitable because of transaction costs, and thus mean reversion is inexistent. We compute the speed of mean reversion of sector specific real exchange rates, conditional on the existence of arbitrage as implied by our nonlinear estimations, and relate them to plausible economic determinants such as tradability and exchange rate volatility. (JEL: F36, F41, C43) Copyright (c) 2003 The European Economic Association.

The Overhang Hangover

The authors revisit the debt overhang question. They first use nonparametric techniques to isolate a panel of countries on the downward sloping section of a debt Laffer Curve. In particular, overhang countries are ones where a threshold level of debt is reached in sample, beyond which (initial) debt ends up lowering (subsequent) growth. On average, significantly negative coefficients appear when debt face value reaches 60 percent of GDP or 200 percent of exports, and when its present value reaches 40 percent of GDP or 140 percent of exports. Second, the authors depart from reduced form growth regressions and perform direct tests of the theory on the thus selected sample of overhang countries. In the spirit of event studies, they ask whether, as the overhang level of debt is reached: (1) investment falls precipitously as it should when it becomes optimal to default; (2) economic policy deteriorates observably, as it should when debt contracts become unable to elicit effort on the part of the debtor; and (3) the terms of borrowing worsen noticeably, as they should when it becomes optimal for creditors to preempt default and exact punitive interest rates. The authors find a systematic response of investment, particularly when property rights are weakly enforced, some worsening of the policy environment, and a fall in interest rates. This easing of borrowing conditions happens because lending by the private sector virtually disappears in overhang situations, and multilateral agencies step in with concessional rates. Thus, while debt relief is likely to improve economic policy (and especially investment) in overhang countries, it is doubtful that it would ease their terms of borrowing or the burden of debt.

Finance and Eciency: Do Bank Branching Regulations Matter?*

We use portfolio theory to quantify the efficiency of state-level sectoral patterns of production in the United States. On the basis of observed growth in sectoral value added output, we calculate for each state the efficient frontier for investments in the real economy, the efficient Sharpe ratio, and the corresponding weights on investments in different industries. We study how rapidly different states converge to an efficient allocation, depending on access to finance. We find that convergence is faster - in terms of distance to the efficient frontier and improving Sharpe ratios - following intra- and (particularly) interstate liberalization of bank branching restrictions. This effect arises primarily from convergence in the volatility of state output growth, rather than in its average. The realized industry shares of output also converge faster to their efficient counterparts following liberalization, particularly for industries that are characterized by young, small and external finance dependent firms. Convergence is also faster for states that have a larger share of constrained industries, greater distance from the efficient frontier before liberalization and larger geographical area. These effects are robust to industries integrating across states and the endogeneity of liberalization dates. Overall, our results suggest that financial development has important consequences for the efficiency and specialization (or diversification) of investments, in a manner that depends crucially on the variancecovariance properties of investment returns, rather than on their average only.

Technology, growth and the business cycle

Using a partial equilibrium model that allows for factor hoarding, I construct series on input utilization rates for ten OECD countries. These series are used in growth accounting computations of total factor productivity which filter out cyclical variations in input utilization rates. The main findings are as follows: (i) adjusted Solow residuals grow consistently faster than standard measures, (ii) the variability of the adjusted Solow residual is in some cases smaller than the standard residuals, (iii) adjusted Solow residuals are less procyclical than standard residuals, and fare better at usual exogeneity tests, (iv) supply shocks are no more symetric between European countries than elsewhere, (v) observed increased output symmetry in Europe is due to demand factors.

One TV, One Price?

We study television prices across European countries and regions. Quality as measured by observable characteristics of televisions accounts for a large share of the international dispersion in prices. Rich economies tend to consume higher-quality goods, but sizeable international price differentials exist even for identical televisions. The valuation of brands differs significantly across borders. EMU countries display lower price dispersion but not necessarily because of the single currency. Absolute price differentials and relative price volatility increase with exchange rate volatility, but not with transport costs. Exchange rate pass-through is low in the short run but high in the long run.