Key points are not available for this paper at this time.
Timothy F. Bresnahan, Peter C. Reiss, Robert Willig, George J. Stigler, Do Entry Conditions Vary across Markets?, Brookings Papers on Economic Activity, Vol. 1987, No. 3, Special Issue On Microeconomics (1987), pp. 833-881
Bresnahan et al. (1987) studied this question.