We compare the optimal trading strategy of an informed speculator when he can trade ahead of incoming news (is “fast”), versus when he cannot (is “slow”). We find that speed matters: the fast speculator's trades account for a larger fraction of trading volume, and are more correlated with short‐run price changes. Nevertheless, he realizes a large fraction of his profits from trading on long‐term price changes. The fast speculator's behavior matches evidence about high‐frequency traders. We predict that stocks with more informative news are more liquid even though they attract more activity from informed high‐frequency traders.

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We study how relationship lending determines the financing of innovation. Exploiting a negative shock to relationships, we show that it reduces the number of innovative firms, especially those that depend more on relationship lending such as small, opaque firms. This credit supply shock leads to reallocation of inventors whereby young and productive inventors leave small firms and move out of geographical areas where lending relationships are hurt. Overall, our results show that credit markets affect both the level of innovation activity and the distribution of innovative human capital across the economy. (JEL G21, O3, J61)

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We propose a model of two-tier competition between vertically integrated firms and unintegrated downstream firms. We show that, even when integrated firms compete in prices to offer a homogeneous input, the Bertrand result may not obtain, and the input may be priced above marginal cost in equilibrium, which is detrimental to consumers' surplus and social welfare. We obtain that these partial foreclosure equilibria are more likely to exist when downstream competition is fierce. We then use our model to assess the impact of several regulatory tools in the telecommunications industry.Journal of Economic Literature Classification Number: L13, L51.

We study a large-scale French reform that provided generous downside insurance for unemployed individuals starting a business. We study whether this reform affects the composition of people who are drawn into entrepreneurship. New firms started in response to the reform are, on average, smaller, but have similar growth expectations and education levels compared to start-ups before the reform. They are also as likely to survive or to hire. In aggregate, the effect of the reform on employment is largely offset by large crowd-out effects. However, because new firms are more productive, the reform has the impact of raising aggregate productivity. These results suggest that the dispersion of entrepreneurial abilities is small in the data, so that the facilitation of entry leads to sizable Schumpeterian dynamics at the firm-level.

We study whether R&D-intensive firms are more resilient to trade shocks. We correct for the endogeneity of R&D using tax-induced changes to R&D costs. While rising imports from China lead to slower sales growth and lower profitability, these effects are significantly smaller for firms with a larger stock of R&D (about half when moving from the bottom quartile to the top quartile of R&D). We provide evidence that this effect is explained by R&D allowing firms to increase product differentiation. As a result, while firms in import-competing industries cut capital expenditures and employment, R&D-intensive firms downsize considerably less. * Johan Hombert is with HEC Paris and CEPR. Adrien Matray is with Princeton University. We thank Nick Bloom;

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