Maria can purchase shirts for $21.00 each. She considers the benefit of one shirt to be $40.00, but with each additional shirt she purchases, the benefit decreases by $5. According to the Principle of Optimization at the Margin, Maria will purchase shirts.

When earning simple interest on money you invest, which statement is true? a. as time goes on and your bank account grows, you earn more interest. b. as time goes on and your bank account grows, you earn less interest. c. as time goes on and your bank account grows, you earn the same amount of interest. d. as time goes on and your bank account grows, you stop earning interest.

You want to make an investment in a continuously compounding account over a period of two years. what interest rate is required for your investment to double in that time period? round the logarithm value and the answer to the nearest tenth.

Assume that the following conditions exist: a. all banks are fully loaned up- there are no excess reserves, and desired excess reserves are always zero. b. the money multiplier is 5 .     c. the planned investment schedule is such that at a 4 percent rate of interest, investment =$1450 billion. at 5 percent, investment is $1420 billion. d. the investment multiplier is 3 . e.. the initial equilibrium level of real gdp is $12 trillion. f. the equilibrium rate of interest is 4 percent now the fed engages in contractionary monetary policy. it sells $1 billion worth of bonds, which reduces the money supply, which in turn raises the market rate of interest by 1 percentage point. calculate the decrease in money supply after fed's sale of bonds: $nothing billion.