But it all turns out how you define the market. As my students all know, markets can be defined in relation to three dimensions: product characteristics, level of geography, and unit of time. A new paper by Rossi-Hansberg, Sarte, and Trachter examines the data at a more local level. While national concentration measures are rising slightly, more local measures are declining. This is consistent with ever more competition (although there have been claims that product differentiation is increasing).
Hat tip: The Grumpy Economist
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