's most persistent pockets of joblessness. Could a more even spatial distribution of innovation reduce American joblessness …? Could Federal policies disperse innovation without significant costs? If research funding is already maximizing knowledge … production, then spatial reallocation of that funding will reduce America's overall innovation unless that reallocation comes …

: local returns to scale in innovation, the elasticity of housing supply, and the importance of local amenities. Even if there … are global increasing returns, the returns to local scale in innovation may be decreasing, and that makes networks more …