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......

If your idea of a good Thai meal involves fruity cocktail drinks served in cartoonish, neon-colored surroundings, then Nava Thai in Wheaton is not the restaurant for you. There are no punny names, no sushi bar, and no fried bananas here, just excellent, authentic Thai food. Yes, the ambiance leaves something to be desired (the walls are a nauseating shade of green), and the location is less than glamorous (practically hidden in the back of......