This paper reviews recent theoretical and empirical work on controls over International capital movements. Theoretical contributions reviewed focus on “second-best “ arguments for capital market restrictions, as well as arguments based on multiple equilibria. The empirical literature suggests that controls have been “effective “ in the narrow sense of influencing yield differentials. But there is little evidence that controls have helped governments meet policy objectives, with the exception of reducing the governments’ debt-service costs, and no evidence that controls have enhanced economic welfare in a manner suggested by theory.