How large are potential benefits from global risksharing? In order to answer this question we propose a new methodology that is closely connected with the empirical growth literature. We obtain estimates of residual risk (growth uncertainty) at various horizons from regressions of country-specific growth in deviation from, world growth on a wide set of variables in the information set. Since this residual risk can be entirely hedged through risksharing, we use it to obtain a measure of the potential welfare gain'for' a representative country. We find that nations can reap very large benefits from, engaging in such risksharing arrangements. We would like to thank Richard Easterlin for his help in obtaining the fertility data. We literature. We obtain estimates of residual risk (growth uncertainty) at various horizons from regressions of country-specific growth in deviation from, world growth on a wide set of vari.ables in the information set. Since this residual risk can be entirely hedged through ri-sksharing, we use it to obtain a measure of the potential welfare gain' for' a representative country. We find that nations can reap very large benefits from, engaging in such risksharing arrangements. Using post-war data, the gain for a 35-year horizon, corresponding to an equivalent permanent increase in consumption, is 6.6% when based on a set of 49 countries, and 1.5% when based on 21 OECD countri.es. Using historical data from. 1870 to 1990, we find that the potential gain for a 120-year hori.zon ranges from. 4-9% for a small set of ri.ch countri.es to 16.5% for a broad set of 24 countri.es.
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