This article discusses the main economic contributions of Paul Krugman. Krugman developed the new trade theory, which analyses the determinants of international trade when trade takes place among oligopolistic firms, and the new economic geography, which studies where firms locate nationally and...

Many stock market analysts think that in 1929, at the time of the crash, stocks were overvalued. Irving Fisher argued just before the crash that fundamentals were strong and the stock market was undervalued. In this paper, we use growth theory to estimate the fundamental value of corporate...