This paper is structured in three parts. The first part outlines the methodological steps, involving both theoretical and empirical work, for assessing whether an observed allocation of resources across countries is efficient. The second part applies the methodology to the long-run allocation of...

This Paper presents a stylized model of international trade and asset price bubbles. Its central insight is that bubbles tend to appear and expand in countries where productivity is low relative to the rest of the world. These bubbles absorb local savings, eliminating inefficient investments and...

Has the US dollar delivered the benefits that the rest of the world is expecting from its holdings of international liquidity? US government debt has been liquid and safe, and it is supplied in sufficient quantity. But it has given a low return to the countries that accumulated the most...