After a successful pricing and output strategy in the 1970s, what does OPEC's history reveal about threats to a practicing cartel? Group of answer choices OPEC amazed economists by avoiding the usual threats of entry and cheating on the cartel price. OPEC has suffered some price cheating by its members but has avoided entry by producers in non-OPEC nations. OPEC policies have avoided price cheating by its members but it has suffered from entry by producers in non-OPEC nations. OPEC has suffered both cheating on price by cartel members and entry by producers in non-OPEC nations