Cities and product variety: evidence from restaurants

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The economic effects of density: A synthesis (2019, background): “In support of the recommended elasticity we highlight that other good work has pointed to a positive impact of density on consumption variety (Schiff 2015) and that Couture’s result is close to the elasticity of urban amenity value with respect to density provided by Ahlfeldt et al. (2015).”
What Can Be Learned from Spatial Economics? (2019, unknown): “Since a larger city hosts a bigger population of heterogeneous consumers, oligopoly theory holds that markets are more competitive, and provide a broader range of varieties and higher-quality goods (Campbell and Hopenhayn 2005, Berry and Waldfogel 2010, Schiff 2015).”