Under Perfect Competition,the Existence of Economic Profits and Losses

Under perfect competition,the existence of economic profits and losses

A) produces economic inefficiencies leading to the misallocation of resources in the long run.
B) generally causes output in the short run to fall in markets where economic profits are being made and to rise in markets where economic losses are being made.
C) creates hardships for producers, leading to industry concentration in the hands of relatively few producers.
D) ensures that output will not be produced at minimum unit cost in the long run.
E) causes firms to enter or leave markets and otherwise reallocate resources in the long run.