The Ellison and Glaeser (1997) index is an unbiased statistic of industrial localization. Though the expected value of the index is known, ad hoc thresholds are used to interpret the extent of localization. We improve the interpretation of the index by simulating confidence intervals that a...

Many industries have two sales stages: the primary market and the aftermarket. Existing research shows consumers are routinely unaware of aftermarkets (Cruickshank, 2000; Hall, 2003); and due to legal or structural restrictions, firms commonly have monopoly power (Borenstein et al., 2000; Adelmann,...

The Ellison-Glaeser (1997) index is an unbiased statistic of industrial localization. Though the expected value of the index is known, ad hoc values are used to interpret the extent of localization. We improve on the interpretation of the index by simulating condence intervals while varying the...