Though it is generally believed that increasing competition improves social welfare, we are able to show with a Shubik–Levitan demand function for differentiated goods that this is not always the case. Under Cournot and Bertrand competition, market entry increases the equilibrium total output...

We estimate by means of indirect inference a structural economic model where firms’ exit and investment decisions are the solution to a discrete-continuous dynamic programming problem. In the model the exit probability depends on the current capital stock and a measure of short-run...