“…A growing number of papers using our instruments confirm these results. The Differentiation IVs introduced in this paper have now been used to obtain precise estimates of substitution patterns in a variety of applied contexts, ranging from demand for cars (Miravete, Moral, andCoşar, Grieco, andTintelnot 2018), scanner data (Miller and Weinberg (2017), Sullivan (2020), Dube, Hortacsu, and Joo (2020)), and school choice (Singleton 2019). See also Conlon and Gortmaker (2019) for additional Monte-Carlo simulation results.…”