Question 12 When you get a vaccine, it benefits others because you can't get them sick. If left to the free market, the socially optimal amount of vaccines would be produced. vaccines would be underproduced. vaccines would be overproduced.

Which statement describes a monopoly? many firms produce identical products with no control over the market price. many firms produce differentiated products with control over market price. a single firm produces a product with no close substitutes and control over the market price. a single firm produces a product with many close substitutes and limited control over the market price.

Two assets have the following expected returns and standard deviations when the risk-free rate is 5%: asset a e(ra) = 18.5% σa = 20% asset b e(rb) = 15% σb = 27% an investor with a risk aversion of a = 3 would find that on a risk-return basis. a. only asset a is acceptable b. only asset b is acceptable c. neither asset a nor asset b is acceptable d. both asset a and asset b are acceptable

Which is cheaper: eating out or dining in? the mean cost of a flank steak, broccoli, and rice bought at the grocery store is $13.04 (money.msn website, november 7, 2012). a sample of 100 neighborhood restaurants showed a mean price of $12.75 and a standard deviation of $2 for a comparable restaurant meal. a. develop appropriate hypotheses for a test to determine whether the sample data support the conclusion that the mean cost of a restaurant meal is less than fixing a comparable meal at home. b. using the sample from the 100 restaurants, what is the p-value? c. at a = .05, what is your conclusion? d. repeat the preceding hypothesis test using the critical value approach