accompany Mankiw & Taylor: Economics 1 – Essaylink

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Practice Questions to accompany Mankiw & Taylor: Economics 1
Chapter 24
1. The following table shows the prices and the quantities consumed in
the country known as the University States. Suppose the base year is
2003. This is the year the typical consumption basket was determined
so the quantities consumed during 2003 are the only quantities needed
to calculate the CPI in every year.
a. What is the value of the CPI in 2003?
Answer:
(€1100/€1100) x 100 = 100
b. What is the value of the CPI in 2004?
Answer:
(€1600/€1100) x 100 = 145.5
c. What is the value of the CPI in 2005?
Answer:
(€2750/€1100) x 100 = 250
d. What is the inflation rate in 2004?
Answer:
[(145.5 – 100)/100] x 100 = 45.5 percent
e. What is the inflation rate in 2005?
Answer:
[(250 – 145.5)/145.5] x 100 = 71.8 percent
f. What type of bias do you observe in the CPI and corresponding
inflation rates you generated above? Explain.
Answer:
Substitution bias, because as the price of pens increased, the quantity consumed declined
significantly.
g. If you had a clause in your wage contract that increased your wage by
the rate of inflation as measured by the CPI calculated above, would
your standard of living increase, decrease, or stay the same over the
years 2003–2005? Why?
Answer:
Increase, because the CPI overstates the increase in the cost of living (assuming that your
expenditure reflects the typical consumption basket in each year).
Practice Questions to accompany Mankiw & Taylor: Economics 2
h. Again, suppose you had a clause in your wage contract that increased
your wage by the rate of inflation as measured by the CPI calculated
above. If you personally only consume pens (no paper or pencils),
would your standard of living increase, decrease, or stay the same over
the years 2003–2005? Why?
Answer:
Decrease, because the price of pens has increased a greater percentage than the CPI.
2. Suppose that you lend your flatmate €100 for one year at 9 per cent
nominal interest.
a. How many dollars of interest will your flatmate pay you at the end of
the year?
Answer:
€9
b. Suppose at the time you both agreed to the terms of the loan, you both
expected the inflation rate to be 5 per cent during the year of the loan.
What do you both expect the real interest rate to be on the loan?
Answer:
9 per cent – 5 per cent = 4 per cent
c. Suppose at the end of the year, you are surprised to discover that the
actual inflation rate over the year was 8 per cent. What was the actual
real interest rate generated by this loan?
Answer:
9 per cent – 8 per cent = 1 per cent
d. In the case described above, actual inflation turned out to be higher
than expected. Which of the two of you had the unexpected gain or
loss? Your flatmate (the borrower), or you (the lender)? Why?
Answer:
Your flatmate (the borrower) gained; you lost because the borrower repaid the loan with
dollars of surprisingly little value.
e. What would the real interest rate on the loan have been if the actual
inflation rate had turned out to be 11 per cent?
Answer:
9 per cent – 11 per cent = –2 per cent
f. Explain what it means to have a negative real interest rate.
Answer:
€3.80 x (172.2/130.7) = €5.01 < €5.15, so the standard of living of a worker earning the
minimum wage improved slightly during the 1990s.

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