When the private costs and the social costs are NOT the same, there is a(n)

Entry in a perfectly competitive market

A) shifts the market supply curve rightward. B) decreases the market price. C) shifts the market supply curve leftward. D) Both answers A and B are correct.

Assume a portfolio in which there is equal investment in two assets that are perfectly positively correlated, with equally expected returns of 10 percent and 6 percent for asset A and 8 percent and 4 percent for asset B

The expected yield on this portfolio is A) 8 percent. B) 7 percent. C) 6 percent. D) 5 percent.