Empirical studies have found that enhanced foreign competition can encourage or discourage innovation. To address this …-product firms live forever, and the large firms invest in innovation in order to enlarge their product spans. All firms export. I … show that an increase in the competitiveness of foreign firms can increase or reduce innovation efforts of a large multi …

We introduce firm and worker heterogeneity into a model of innovation-driven endogenous growth. Individuals who differ …