We show a causal impact of immigration on innovation and dynamism in US counties. To identify the causal impact of … recent decades. We show four main results. First, immigration has a positive impact on innovation, measured by the patenting … impact of immigration on innovation percolates over space, but spatial spillovers quickly die out with distance. Fourth, the …

-run growth by increasing the profit from innovation. In the short run, factors of production must be reallocated inside firms …, which lowers the opportunity cost of innovation, generating an additional trapped factor effect. Starting from a baseline …