This dissertation consists of two essays in the area of Industrial Organization.In Chapter 1, I investigate the role of network effects in explaining the within-firm rate of technology adoption. I study the conversion of movie distribution and exhibition from 35mm film to digital technology. These industries constitute a hardware-software system with indirect network effects. I specify and estimate a dynamic oligopoly game of digital hardware adoption by movie theaters and digital movies (software) supply by movie distributors. Crucially, theaters' technology-adoption decisions are made at the screen level so diffusion occurs both within and across firms. Counterfactual simulations establish that: (1) at the industry level, diffusion occurs...