Tombstones are produced in a competitive price-searcher market. One producer, Rolling Stones, sells 20 tombstones a week at a price of $500 each. Its average total cost is $600. From this information, we can conclude:_______

a. new tombstone firms will want to enter.
b. this producer is losing $2,000 a week.
c. this producer is making an economic profit of $400.
d. this producer is setting MR = MC.
e. this producer should increase production.