Answer:
product differentiation
Step-by-step explanation:
Product differentiation is a tactic available to companies competing in the monopolistic competition system. It is an economic model where few companies offer the same product, but with differentiations. Thus, companies in this competitive model have some power to influence prices. In addition to the headphone market, a good example of perfect competition is the toothpaste market, where companies launch the same product but with differentiations. For example, toothpaste with whitening.