Refer to the diagrams, which pertain to a purely competitive firm producing output q and the industry in which it operates. In the long run we should expect MC ATC S AVC P -MR P D 0 0 Q O no change in the number of firms in this industry O firms to leave the industry, market supply to rise, and product price to fall. O firms to enter the industry, market supply to rise, and product price to fall. O firms to leave the industry, market supply to fall, and product price to rise