For long run equilibrium in a perfectly competitive industry Price must Group of answer choices equal SRATC to ensure that firms do not have an incentive to change the plant size equal SRATC to ensure that firms do not have an incentive to enter or exit the industry equal LRATC to ensure that firms do not have an incentive to change the plant size equal MR to ensure that firms do not have an incentive to change the output level None of these answers is correct