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Most people wouldn’t ask an economist where to get dinner. But Tyler Cowen, a professor at George Mason University and author of the economics blog Marginal Revolution, has become an unlikely food critic with the popularity of his expansive Ethnic Dining Guide. Grounded in basic economic principles, Cowen’s somewhat unusual dining philosophy has allowed him to discover arguably some of the best ethnic restaurants in D.C., Maryland, and Virginia. Last week, Cowen spoke to DCist…