Perfect competition is the only market structure in which firms are economically efficient in the long run

In the first calendar quarter a company issues a surprising report saying that it expects profits to rise in the fourth quarter. The theory of efficient markets says we should expect the price of the company's stock to:

A. rise around the third quarter since this information will take time to disseminate. B. rise immediately on the expectation of higher profits in the future. C. fall immediately as stockholders will be disappointed about having to wait until the fourth quarter for higher profits. D. rise in the fourth quarter when the higher profits are actually seen.

A temporary decrease in the price of oil would be considered a:

A. long-run supply shock. B. demand shock. C. short-run supply shock. D. The changing price of oil would not affect any of these.