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Paul Robin Krugman is an American economist, Professor of Economics and International Affairs at the Woodrow Wilson School of Public and International Affairs at Princeton University, Centenary Professor at the London School of Economics, and an op-ed columnist for The New York Times. In 2008, Krugman won the Sveriges Riksbank Prize in Economic Sciences for his contributions to New Trade Theory and New Economic Geography. According to the Nobel Prize Committee, the prize was given for Krugman's work explaining the patterns of international trade and the geographic concentration of wealth, by examining the impact of economies of scale and of consumer preferences for diverse goods and services. Krugman is known in academia for his work on international economics (including trade theory, economic geography, and international finance), liquidity traps and currency crises. He is the 17th most widely cited economist in the world today and is ranked among the most influential academic thinkers in the US. As of 2008, Krugman has written 20 books and has published over 200 scholarly articles in professional journals and edited volumes. He has also written more than 750 columns on economic and political issues for The New York Times. He also writes on topics ranging from income distribution to international economics. Krugman considers himself a liberal, calling one of his books and his New York Times blog "The Conscience of a Liberal". His commentary has attracted considerable comment and criticism. (via DBpedia)