perfect competition A market structure in which there are many sellers, many buyers, and identical products; demand and supply determine price and quantity. One of four basic competitive markets structures. Related Related Articles: What We Might Not Know About Big TechLearn With Elaine: McDonald’s Speedy Drive-ThruWhat We Can Learn From Ketchup and MustardAll You Could Want To Know About ChocolateUsing Economics To Deal With Restaurant No-Shows Ann Mills Share This Previous Articleopen corporation Next Articlerecession December 17, 2020