Economic theory suggests that market economies are likely to under-provide innovation due to the public good nature of knowledge. Empirical evidence from the US and other advanced economies supports this idea. We summarize the pros and cons of different policy instruments for promoting innovation and provide a basic "toolkit" describing which policies are most effective, based on our reading of the evidence. In the short-run, R&D tax credits or direct public funding seem the most productive, but...
A number of recent papers have argued that US firms exert increasing market power, as measured by their markups of price over marginal cost. I review three of the main approaches to estimating economy-wide markups and show that all are based on the hypothesis of firm cost-minimization. Yet different assumptions and methods of implementation lead to quite different conclusions regarding the levels and trends of markups. I survey the literature critically, and argue that some of the startling find...