International Arbitrage and Interest Rate Parity 9
a 90-day forward contract. The current spot rate is $0.0227. Ninety-day interest rates available to
Blades in the U.S. are 2 percent, while 90-day interest rates in Thailand are 3.75 percent (these rates
are not annualized). Holt is aware that covered interest arbitrage, unlike locational and triangular
arbitrage, requires an investment of funds. Thus, he would like to be able to estimate the dollar profit
resulting from arbitrage over and above the dollar amount available on a 90-day U.S. deposit.
Determine whether the forward rate is priced appropriately. If it is not priced appropriately, determine
the profit you could generate for Blades by withdrawing $100,000 from Blades’ checking account and
engaging in covered interest arbitrage. Measure the profit as the excess amount above what you could
generate by investing in the U.S. money market.
Covered Interest Arbitrage
4. Why are arbitrage opportunities likely to disappear soon after they have been discovered? To illustrate
your answer, assume that covered interest arbitrage involving the immediate purchase and forward sale
of baht is possible. Discuss how the baht’s spot and forward rates would adjust until covered interest
arbitrage is no longer possible. What is the resulting equilibrium state called?
ANSWER: Arbitrage opportunities are likely to disappear soon after they have been discovered
because of market forces. Due to the actions taken by arbitrageurs, supply and demand for the foreign
Solution to Supplemental Case: Crayson Co.
a. Crayson could invest its $5 million in 10 million zyn, earn 2% over the quarter, and would receive
10,200,000 at the end of the quarter. This should convert to 5,100,000 euros at the end of the quarter.
When investing at the beginning of the quarter, Crayson would simultaneously sell 5,100,000 euros
forward. Assuming that the zyn remained tied to the euro, Crayson’s forward sale would perfectly
hedge its exposure. The 5,100,000 euros convert to $5,100,000, which would result in a quarterly
return of 2%.
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