Market share/market power revisited. A new test for an old theory.
D054598:Blue Cross Blue Shield Insurance Plans / Q000191:economics*; D004465:Economic Competition; D004469:Economics, Hospital; D005249:Fees and Charges; D006302:Health Services Research; D007196:Indiana; D007348:Insurance, Health / Q000191:economics*; D007350:Insurance, Hospitalization / Q000191:economics*; D011209:Power, Psychological; D011243:Preferred Provider Organizations / Q000191:economics*; D013223:Statistics as Topic