Paf is a small country. Its currency is the pif and the exchange rate with the U.S. dollar
was 2 pifs
per dollar in 1980. The inflation indexes in 1980 were equal to 100 in the United States
and in Paf. Twenty years later, the inflation indexes were equal to 400 in the United
States and 200 in Paf. The current exchange rate is 0.9 pifs per dollar.
a. What should the current exchange rate be if PPP prevailed?
b. Is the Pif over/undervalued according to PPP?
Back in 1990, East Germany was in the process of merging into West Germany. Its
national currency was to be replaced by the Deutsche mark (DM). A U.S. dollar-based
investor has a portfolio worth DM 100 million in German bonds. The current spot
exchange rate is 2 DM/$. The current one-year market interest rates are 6% in DM and
10% in dollars. One-year currency options are quoted in Chicago with a strike price of
50 U.S. cents per DM; a call DM is quoted at 1 U.S. cent and a put
DM is quoted at 1.2 U.S. cents; these option prices are for one DM.
You are worried that the integration of East and West Germany will cause inflation in
Germany and a drop in the DM. So, you consider using forward contracts or options to
hedge the currency risk.
a. What is the one-year forward exchange rate DM/$?
b. Simulate the dollar value of your portfolio assuming that its DM value stays at DM
100 million; use DM/$ spot exchange rates equal in one year to: 1.6, 1.8, 2, 2.2, and
2.4. First consider a currency forward hedge, then a currency-option insurance.
c. What could make your forward hedge imperfect?