A(n) ________ is a single firm with ________, whereas ________ implies an industry with ________ firm(s) that has(have) ________. oligopoly; no barriers to entry; monopoly; many; easy entry and exit monopoly; barriers to entry; monopolistic competition; many; easy entry and exit monopoly; barriers to entry; oligopoly; few; no barriers to entry monopolistic competitor; barriers to entry; monopoly; one; barriers to entry