Indicate which of the following would cause a shift in the aggregate demand curve from point a to point c. (mark all that apply.)
a. lower interest rates
b. increased consumer optimism
c. lower taxes
d. decrease in the price level
e. inflation
f. decrease in the u. s. exchange rate relative to other currencies

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