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The 2008 Nobel prize for economics was awarded to Paul Krugman for three papers - Krugman (1979, 1980, 1991). In this paper we illustrate that, indeed, these three papers are closely connected. We present - a summary of - the papers using a unified framework. Central in the discussion is the...
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to perform a controlled experiment that captures important characteristics of the real world. Relative to traditional …, allowing us to establish causality rather than mere correlation. Relative to a laboratory experiment, a field experiment gives …
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