Technology lock-in advocates argue that governments should step in to coordinate technology adoption decisions. Due to the presence of network effects, advocates warn that consumers may fail to adopt the best technology, thus missing out on potential benefits. Even worse, consumers may split,...

We find that the effects of parent firm R & D on plant-level productivity are diminished by both the geographic and technological distance between the research lab and the plants, that productivity appears to depend on R & D per plant rather than on the total amount, and that spillovers from...

Startups are a key driver of innovation but are frequently the target of acquisition by incumbent firms. How does this affect the types of products that are developed? We study a model in which an entrant decides whether to develop either a product that is a partial substitute for an...

We build a model of firm-level innovation, productivity growth and reallocation featuring endogenous entry and exit. A new and central economic force is the selection between high- and low-type firms, which differ in terms of their innovative capacity. We estimate the parameters of the model...

We build a model of firm-level innovation, productivity growth and reallocation featuring endogenous entry and exit. A key feature is the selection between high- and low-type firms, which differ in terms of their innovative capacity. We estimate the parameters of the model using detailed US...

We build a model of firm-level innovation, productivity growth and reallocation featuring endogenous entry and exit. A new and central economic force is the selection between highand low-type firms, which differ in terms of their innovative capacity. We estimate the parameters of the model using...

We show that the presumed incompatibility of R&D and competition in Spence (1984) is not fundamental, but hinges on a critical modeling choice. Specifically, we show that for a widely used class of R&D technology, that is, the functional form mapping R&D effort into cost reduction, the...

Models of creative destruction posit that recessions are periods of reallocation and disruption, generating new ideas that catapult new firms to the frontier. However, empirical evidence suggests that research and development (R&D) expenditures and patenting is procyclical, not counter-cyclical....

We build a model of firm-level innovation, productivity growth and reallocation featuring endogenous entry and exit. A key feature is the selection between high- and low-type firms, which differ in terms of their innovative capacity. We estimate the parameters of the model using detailed US...

We provide the first measurement of knowledge spillovers from venture capital-financed companies onto the patenting activities of other companies. On average, these spillovers are nine times larger than those generated by the R&D investment of established companies. Spillover effects are larger...