Hurricane Katrina destroyed oil and natural gas refining capacity in the Gulf of Mexico. This subsequently drove up natural gas, gasoline, and heating oil prices. As a result, this should B) shift the short-run aggregate supply curve to the right. D) move the economy down along a stationary short-run aggregate supply curve. C) move the economy up along a stationary short-run aggregate supply curve. A) shift the short-run aggregate supply curve to the left.

Consider a treasury bill with a rate of return of 5% and the following risky securities: security a: e(r) = .15; variance = .0400 security b: e(r) = .10; variance = .0225 security c: e(r) = .12; variance = .1000 security d: e(r) = .13; variance = .0625 the investor must develop a complete portfolio by combining the risk-free asset with one of the securities mentioned above. the security the investor should choose as part of her complete portfolio to achieve the best cal would be a. security a b. security b c. security c d. security d