The diffusion of knowledge generates positive externalities if knowledge flows increase the productivity of Research and Development (R&D) by the recipients of these flows. This paper investigates the extent to which this positive spillover effect of knowledge diffusion depends on the similarity...

We use geocoded administrative data from Texas on all business establishments to estimate the effects of localization economies on the spatial persistence of industrial employment for the software industry. We decompose this persistence into components arising from entry rates, firm growth, and...