As HOMEWORKLIB's policy, only the first four sub parts are answered.
Zane has $100
cost of polo shirt = $25
Sub part a:
Since Zane has $100 and one polo shirt costs $25, he can buy 100/25 = 4 shirts today
Sub part b:
Zane invests in risk free US treasury that earns 9% nominal interest.
Zane will have 100*(1+9%) at the end of the year = 100*(1+0.09) = 100(1.09) = $109
Sub part c:
Since inflation is 5%, the cost of all goods and services will go up by 5%.
Hence the cost of polo shirt will also grow by 5% to 25*(1+5%) = $26.25
Sub part d:
Zane has $109 at the end of the year and the polo shirt cost $26.25. Hence Zane will be able to buy 109/26.25 = 4.1524 shirts
in percentage terms it will be = (4.1524 - 4)/4 = 3.81%
Sub part e:
(1+nominal return) = (1+real return) *(1+inflation)
(1+real return) = (1+nominal return) / (1+inflation) = (1+9%)/(1+5%) = 1.03809
hence real return = 1.03809 - 1 = 0.03809 = 3.81%
This is the same as Zane's buying power found in part d. Real return reflects the fact that inflation reduces the value of money over time. Hence nominal return itself is not sufficient to determine the buying power. one has to account for inflation to determine the real buying buying. This real buying buyer is depicted by real return.
P6-3 Real and nominal rates of interest Zane Perelli currently has $100 that he can spend...
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