Firms are more productive on average in larger cities. Two explanations have been offered:agglomeration economies (larger cities promote interactions that increase productivity) and firmselection (larger cities toughen competition allowing only the most productive to survive). Todistinguish...

Firms are more productive on average in larger cities. Two explanations have been offered:agglomeration economies (larger cities promote interactions that increase productivity) and firmselection (larger cities toughen competition allowing only the most productive to survive). Todistinguish...