Why is it that adopting new technologies takes so long and costs so much? Clearly, firms do not know all the details necessary to implement a complex technology efficiently; learning these details requires extensive search. However, this explanation has a problem: even limited search may be so...

This paper provides the first look at patent litigation hazards for public firms during the 80s and 90s. Consistent with our model, litigation is more likely when prospective defendants spend more on R&D, when prospective plaintiffs acquire more patents and when firms are larger and...

Does the disclosure requirement of the patent system encourage the diffusion of inventions? This paper builds a simple model where firms choose between patents and trade secrecy to protect inventions. Diffusion is not necessarily more likely with a patent system nor is the "market for...

Open source software, developed by volunteers, appears counter to the conventional wisdom that private provision of public goods is socially more efficient. But complexity makes a difference. Under standard models, development contracts for specialized software may be difficult to write and...

The role of historical accident in technology selection has been difficult to measure. This paper develops a quantifiable model for a basic and widely applicable form of path dependence: the random walk. This real options model is applied to the transition in British cotton spinning at the...

Did nineteenth century technology reduce demand for skilled workers in contrast to modern technology? I obtain direct evidence on human capital investments and the returns to skill by using micro-data on individual weavers and an engineering production function. Weavers learned substantially on...

Innovative ideas have unique properties arising from low communication costs. But ideas come from knowledge that is costly to communicate. “Formalizing” knowledge — codifying, developing standards, etc. — reduces these costs. In a simple model, formalization is associated with changes in...

This paper estimates the total cost of patent litigation to alleged infringers. We use a large sample of stock market event studies around the date of lawsuit filings for US public firms from 1984-99. We find that the total costs of litigation are much greater than legal fees and costs are large...

How could such industries as software, semiconductors, and computers have been so innovative despite historically weak patent protection? We argue that if innovation is both sequential and complementary--as it certainly has been in those industries--competition can increase firms' future profits...

International comparisons of patent systems are essential to harmonization treaties and to analyze economic growth. Yet these comparisons often rely on little but conventional wisdom. This paper develops an empirical method to compare the economic strength and quality of patent systems by using...