The minimum of average cost helps in finding the interior best choice. tells us if ACmin is less than market price to leave the market. tells us if ACmin is greater than market price to stay in the market. tells us if ACmin is greater than market price to leave the market. tells us if ACmin is less than market price to stay in the market. tells us if the average cost of a product is desirable. tells us the profit maximizing quantity and price. tells us if its profitable to stay or leave market.