Though theory suggests financial globalization should improve international risk sharing, empirical support has been limited. We develop a simple welfare-based measure that captures how far countries are from the ideal of perfect risk sharing. We then take it to data and find international risk sharing has, indeed, improved during globalization. Improved risk sharing comes mostly from the convergence in rates of consumption growth among countries rather than from synchronization of consumption at the business cycle frequency. Our finding explains why many existing measures fail to detect improved risk sharing-they focus only on risk sharing at the business cycle frequency.

We show empirically that regions with a more specialized production structure exhibit output fluctuations that are less correlated with those of other regions (less symmetric fluctuations). Combined with the causal relation running from capital market integration to regional specialization found in an earlier study, this finding supports the idea that higher capital market integration leads to less symmetric output fluctuations. This mechanism counter-balances the effect of lower trade-barriers on the symmetry of fluctuations quantified by Frankel and Rose (1998). It is further argued that more asymmetric output shocks do not necessarily imply more asymmetric income shocks, since more cross-country ownership of productive assets may actually render income shocks more symmetric despite the greater asymmetry of output shocks. Some evidence in support of this claim is reported. Deriving a simple closed form expression for the gains from risk sharing for CRRA utility is an independent contribution of the present article.

The paper investigates the determinants of business cycles synchronization across regions. It uses both international and intranational data to evaluate the linkages between trade in goods, trade in financial assets, specialization and business cycles synchronization using a system of simultaneous equations. The results are as follows: (i) Simultaneity is important, as both trade and financial openness have a direct and an indirect effect on cycle synchronization. (ii) A variety of alternative measures of financial integration suggest that regions with strong financial links are significantly more synchronized, though they are also more specialized. (iii) Specialization patterns have a sizable effect on business cycles, beyond their reflection of intra-industry trade, and of openness to goods and assets trade. (iv) The estimated role of trade is in line with existing models once intra-industry trade is controlled for. The results relate to a recent strand of international business cycle models with incomplete markets and transport costs, and, on the empirical side, point to an important omission in the usual criteria defining an optimal currency area, namely specialization patterns.

The effective governance of global money and finance is under enormous stress. Deep changes over the last decade in capital markets, exchange rate systems, and government finances suggest dramatic shifts in the contours of monetary power, with tensions rising between the functional logic of international economics and the geographic logic of state-centered politics. Governing the World's Money assesses those tensions and the prospects for their peaceful resolution. Governing the World's Money surveys the frontiers of the global monetary system in ten original essays. Leading scholars of international relations and economics explore the evolution of the instruments available to policy officials for monetary governance. As they analyze the contemporary reordering of political authority in a market-oriented global economy, they open new pathways for the study of regional monetary integration and international institutional reform.