Economist Avinash Dixit of Princeton oncewrote, "Never have I arrived at a coffee shop only to betold, 'Sorry; wedon't have coffeetoday.' . . . How did they know I would come and why were they ready and willing to serveme?"

Source: AvinashDixit, Microeconomics: A Very Short Introduction, NewYork: Oxford UniversityPress, 2014, p. 1.

Which of the following statements istrue?

A.

Coffee shops are ready and willing to serve coffee to anyone willing to pay the equilibriumprice, which is the price that will cover all of their costsincluding the opportunity cost of the funds the owners have invested in the firm.

B.

Although the coffee shopdoesn't know when Professor Dixit will arrive(or whether on a particular day he will come atall), the shop expects that at the current equilibriumprice, enough buyers will be available to buy the coffee they are selling.

C.

Firms will supply to every consumer willing to pay a price equal to thelong-run average cost of production all of a good or service the consumer wishes to purchase.

D.

All of the above.