. Consistent with our theory, vertical differentiation affects exports via sunk costs and the extensive margin, whereas the effect …

We present a model of endogenous firm growth with R&D investment and stochastic innovation as the engines of growth …

protection can stimulate innovation. However, the empirical literature has consistently found skeptical results on the positive … our model, broadening leading breadth can negatively affect innovation because each innovator is incentivized to free …