Foreign Exchange Derivatives: Forwards, Futures, Options, and Currency Swaps
Book: Financial Markets and Institutions, 11th Edition Author: Jeff Madura Publisher: Cengage Learning, 2015 ISBN: 978-1-133-94788-2
Chapter 16 is where things get global. If you have ever traveled abroad and exchanged dollars for euros or pesos, you already know the basics of the foreign exchange market. But there is a whole world of derivative instruments built on top of currency exchange rates. And they move serious money. Foreign exchange derivatives account for about half of all daily forex transaction volume.
How the Forex Market Works
The foreign exchange market is not a physical place. It is a global telecommunications network among large commercial banks in cities like New York, Tokyo, London, Hong Kong, and Frankfurt. These banks act as intermediaries for anyone who needs to exchange currencies.
At any given moment, banks quote a bid price (what they will pay to buy a currency) and an ask price (what they will charge to sell it). The spread between the two is how they make money on the transaction.
Exchange rates can be quoted two ways. The direct rate tells you how many U.S. dollars one unit of foreign currency is worth. The indirect rate tells you how many units of foreign currency equal one U.S. dollar. They are just reciprocals of each other. If a peso is worth $0.10, then $1 buys 10 pesos.
Cross-exchange rates come up when you need to convert between two non-dollar currencies. If a peso is worth $0.07 and a Canadian dollar is worth $0.70, then one Canadian dollar equals 10 pesos. Simple math, but important for international trade.
Exchange Rate Systems
The world has gone through different exchange rate systems over time. From 1944 to 1971, we had the Bretton Woods system where governments kept exchange rates within 1% of a fixed value. That ended in 1971 with the Smithsonian Agreement, which widened the band to 2.25%. By 1973, major currencies were floating freely.
Today, most countries use a dirty float. Exchange rates are set by the market, but governments still step in occasionally to push their currency in one direction or another. Some countries peg their currency to the dollar. Hong Kong has kept the Hong Kong dollar pegged to the U.S. dollar since 1983. China had a similar peg until 2005 when it allowed the yuan to float within narrow boundaries.
The eurozone is its own arrangement. Sixteen countries (at the time of writing) share the euro. No exchange rate risk between them, but they also cannot use their own monetary policy to fix local problems. That became painfully obvious during the 2010-2012 Greek crisis when the entire eurozone suffered because one country was struggling.
What Moves Exchange Rates
Three main forces push exchange rates around.
Inflation differentials. If the U.S. has higher inflation than Europe, American consumers start buying more European goods. That increases demand for euros, pushing the euro up. The theory behind this is purchasing power parity (PPP). It says exchange rates should adjust to reflect inflation differences between countries. In practice, it works as a rough guide but not a precise predictor.
Interest rate differentials. Higher interest rates in a country attract foreign investors who need that country’s currency to invest. This increases demand for the currency and pushes its value up. If U.S. rates suddenly jump above European rates, investors sell euros and buy dollars to invest in U.S. securities.
Central bank intervention. Central banks can directly intervene by buying or selling currencies in the market. Or they can use indirect intervention by changing interest rates. During the 1997 Asian crisis, Thailand and Malaysia raised interest rates to discourage investors from pulling out. Brazil doubled its rates from 20% to 40%. Russia tripled its rates from 50% to 150%. These moves were desperate attempts to stop capital flight and save their currencies.
Forecasting Exchange Rates
Madura covers four forecasting approaches. Technical forecasting uses historical patterns. Fundamental forecasting uses economic variables like inflation and interest rates. Market-based forecasting uses the current spot rate or forward rate as a predictor. Mixed forecasting combines all three with weighted averages.
The honest conclusion? No single technique consistently outperforms the others. Exchange rate forecasting is hard.
The Four Foreign Exchange Derivatives
Here is where the chapter gets practical.
Forward contracts are custom agreements with a commercial bank to exchange currencies at a set rate on a future date. They let you lock in a price. If you know you will need to convert pounds to dollars in six months, you can eliminate the guessing game by agreeing on the rate now.
Currency futures contracts are like forwards but standardized. They trade on exchanges like the CME, have set amounts and maturity dates. Less flexible than forwards, but easier to trade.
Currency swaps are agreements to periodically exchange one currency for another at specified rates. Think of them as a series of forward contracts bundled together. Banks serve as intermediaries to match parties with opposite currency needs.
Currency options give you the right (not the obligation) to buy or sell a currency at a specified price within a time period. Call options let you buy. Put options let you sell. The big advantage over forwards and futures is flexibility. If the exchange rate moves in your favor, you just let the option expire and use the spot market instead. The downside is that options cost a premium upfront.
Hedging vs. Speculating
Both hedgers and speculators use these instruments, but for different reasons.
A hedger might be a U.S. company expecting to receive British pounds in six months. They worry the pound might drop, so they sell pounds forward to lock in a rate.
A speculator might believe the Singapore dollar is about to appreciate. They buy Singapore dollar futures or call options, hoping to profit when the rate rises.
The chapter includes a nice example of comparing futures speculation to options speculation on the British pound, with probability distributions for different outcomes. It shows the risk-return tradeoff clearly. Futures have unlimited upside and downside. Options limit your loss to the premium paid.
International Arbitrage
The last section covers three types of arbitrage that keep exchange rates in line.
Locational arbitrage happens when two banks quote different rates for the same currency. You buy at the cheap bank and sell at the expensive one. Free money, but it disappears fast.
Triangular arbitrage exploits misaligned cross-exchange rates. If the dollar-to-peso rate and the dollar-to-Canadian-dollar rate do not match up with the peso-to-Canadian-dollar rate, traders can cycle through all three currencies and pocket the difference.
Covered interest arbitrage takes advantage of gaps between forward rate premiums and interest rate differentials between countries. Interest rate parity says these should be equal. When they are not, investors can earn risk-free profits by investing in the higher-rate country and simultaneously hedging with forward contracts.
All three types of arbitrage are self-correcting. The act of exploiting the discrepancy pushes prices back into alignment. That is why these opportunities rarely last more than seconds.
My Take
This chapter ties together a lot of concepts from earlier in the book. You need to understand interest rates, inflation, and derivatives to really get forex markets. What struck me most is how interconnected everything is. A central bank decision in one country can set off a chain reaction across the globe. The examples from the Mexican peso crisis, the Asian crisis, and the Russian crisis show how quickly things can spiral when confidence breaks down.
The arbitrage section is especially elegant. It shows how financial markets are constantly self-correcting through the actions of profit-seeking traders. Nobody needs to coordinate anything. The incentive to make money keeps prices honest.
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