Derivatives contracts can be divided into two general families:

1. Contingent claims, e.g. options

2. Forward claims, which include exchange-traded futures, forward contracts and swaps

A swap is an agreement between two parties to exchange sequences of cash flows for a set period of time. Usually, at the time the contract is initiated, at least one of these series of cash flows is determined by a random or uncertain variable, such as an interest rate, foreign exchange rate, equity price or commodity price. Conceptually, one may view a swap as either a portfolio of forward contracts, or as a long position in one bond coupled with a short position in another bond. This article will discuss the two most common and most basic types of swaps: the plain vanilla interest rate and currency swaps.

The Swaps Market

Unlike most standardized options and futures contracts, swaps are not exchange-traded instruments. Instead, swaps are customized contracts that are traded in the over-the-counter (OTC) market between private parties. Firms and financial institutions dominate the swaps market, with few (if any) individuals ever participating. Because swaps occur on the OTC market, there is always the risk of a counterparty defaulting on the swap.

The first interest rate swap occurred between IBM and the World Bank in 1981. However, despite their relative youth, swaps have exploded in popularity. In 1987, the International Swaps and Derivatives Association reported that the swaps market had a total notional value of $865.6 billion. By mid-2006, this figure exceeded $250 trillion, according to the Bank for International Settlements. That’s more than 15 times the size of the U.S. public equities market.

Plain Vanilla Interest Rate Swap

The most common and simplest swap is a plain vanilla interest rate swap. In this swap, Party A agrees to pay Party B a predetermined, fixed rate of interest on a notional principal on specific dates for a specified period of time. Concurrently, Party B agrees to make payments based on a floating interest rate to Party A on that same notional principal on the same specified dates for the same specified time period. In a plain vanilla swap, the two cash flows are paid in the same currency. The specified payment dates are called settlement dates, and the time between are called settlement periods. Because swaps are customized contracts, interest payments may be made annually, quarterly, monthly, or at any other interval determined by the parties.

For example, on Dec. 31, 2006, Company A and Company B enter into a five-year swap with the following terms:

• Company A pays Company B an amount equal to 6% per annum on a notional principal of $20 million.
• Company B pays Company A an amount equal to one-year LIBOR + 1% per annum on a notional principal of $20 million.

LIBOR, or London Interbank Offer Rate, is the interest rate offered by London banks on deposits made by other banks in the eurodollar markets. The market for interest rate swaps frequently (but not always) uses LIBOR as the base for the floating rate. For simplicity, let’s assume the two parties exchange payments annually on December 31, beginning in 2007 and concluding in 2011.

At the end of 2007, Company A will pay Company B $20,000,000 * 6% = $1,200,000. On Dec. 31, 2006, one-year LIBOR was 5.33%; therefore, Company B will pay Company A $20,000,000 * (5.33% + 1%) = $1,266,000. In a plain vanilla interest rate swap, the floating rate is usually determined at the beginning of the settlement period. Normally, swap contracts allow for payments to be netted against each other to avoid unnecessary payments. Here, Company B pays $66,000, and Company A pays nothing. At no point does the principal change hands, which is why it is referred to as a notional amount. Figure 1 shows the cash flows between the parties, which occur annually (in this example).

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