Sam is one of many potato growers who sell potatoes to a large food-processing plant. It is safe to assume that potatoes are sold in perfectly competitive markets. The price of a bushel of potatoes is $4 and Sam sells 100 bushels at that price. He has $250 of fixed cost. Sam figures if he produces one more bushel of potatoes, his total variable costs will increase from $175 to $180. Should Sam produce any more potatoes at the $4 price? Explain. Show how you came to your answer.