How Big are the Gains from International Financial Integration?

The literature has shown that the implied welfare gains from international financial integration are very small. We revisit the existing findings and document that welfare gains can be substantial if capital goods are not perfect substitutes. We use a model of optimal savings that includes a production function where the elasticity of substitution between capital varieties is less then infinity, but more than the value that would generate endogenous growth. This production structure is consistent with empirical estimates of the actual elasticity of substitution between capital types, as well as with the relatively slow speed of convergence documented in the growth literature. Calibrating the model, our results are that welfare gains from financial integration are equivalent to a 9% increase in consumption for the median developing country, and up to 14% for the most capital-scarce. These gains rise substantially if capital's share in output increases even modestly above the baseline value of 0.3, and remain large even if inflows of foreign capital after integration are limited to a fraction of the existing capital stock.