Which of the following identifies what has driven American agriculture for the past 50 years? -global demand for food
-trade barriers
-horizontal consolidation
-tariffs on imported goods

Firms like papa john’s, domino’s, and pizza hut sell pizza and other products that are differentiated in nature. while numerous pizza chains exist in most locations, the differentiated nature of these firms’ products permits them to charge prices above marginal cost. given these observations, is the pizza industry most likely a monopoly, perfectly competitive, monopolistically competitive, or an oligopoly industry?