Markets work most efficiently when: there are many external costs and benefits. buyers and sellers have different information. there are many public goods. there are many buyers and sellers.Suppose that during a lull in air travel, the government establishes a price floor on airline ticket prices, causing the average price of an airline ticket in the continental United States to rise by $350. Who benefits from this price increase? airlines still able to sell tickets consumers both consumers and the airlines consumers who no longer purchase airline tickets