Financial Innovation and Derivatives

admin — Fri, 24 Apr 2009 11:01:51 +0000

The investment diversity desired by households is far greater than most businesses have a desire to satisfy. Most firms find it simpler to issue “plain vanilla” securities, leaving exotic variants to others who specialize in financial markets. This, of course, creates a profit opportunity for innovative security design and repackaging that investment bankers are only too happy to fill.
Consider the astonishing changes in the mortgage markets since 1970, when mortgage pass-through securities were first introduced by the Government National Mortgage Association (GNMA, or Ginnie Mae). These pass-throughs aggregate individual home mortgages into relatively homogenous pools. Each pool acts as backing for a GNMA pass-through security. GNMAsecurity holders receive the principal and interest payments made on the underlying mortgage pool. For example, the pool might total $100 million of 10 percent, 30-year conventional mortgages. The purchaser of the pool receives all monthly interest and principal payments made on the pool. The banks that originated the mortgages continue to service them but no longer own the mortgage investments; these have been passed through to the GNMAsecurity holders.
Pass-through securities were a tremendous innovation in mortgage markets. The securitization of mortgages meant that mortgages could be traded just like other securities in national financial markets. Availability of funds no longer depended on local credit conditions; with mortgage pass-throughs trading in national markets, mortgage funds could flow from any region to wherever demand was greatest.
The next round of innovation came when it became apparent that investors might be interested in mortgage-backed securities with different effective times to maturity. Thus was born the collateralized mortgage obligation, or CMO. The CMO meets the demand for mortgage-backed securities with a range of maturities by dividing the overall pool into a series of classes called tranches. The so-called fast-pay tranche receives all the principal payments made on the entire mortgage pool until the total investment of the investors in the tranche is repaid. In the meantime, investors in the other tranches receive only interest on their investment. In this way, the fast-pay tranche is retired first and is the shortest-term mortgage-backed security. The next tranche then receives all of the principal payments until it is retired, and so on, until the slow-pay tranche, the longest-term class, finally receives payback of principal after all other tranches have been retired.
Although these securities are relatively complex, the message here is that security demand elicited a market response. The waves of product development in the last two decades are responses to perceived profit opportunities created by as-yet unsatisfied demands for securities with particular risk, return, tax, and timing attributes. As the investment banking industry becomes ever more sophisticated, security creation and customization become more routine. Most new securities are created by dismantling and rebundling more basic securities. For example, the CMO is a dismantling of a simpler mortgage-backed security into component tranches. AWall Street joke asks how many investment bankers it takes to sell a lightbulb. The answer is 100—one to break the bulb and 99 to sell off the individual fragments.
This discussion leads to the notion of primitive versus derivative securities. A primitive security offers returns based only on the status of the issuer. For example, bonds make stipulated interest payments depending only on the solvency of the issuing firm. Dividends paid to stockholders depend as well on the board of directors’assessment of the firm’s financial position. In contrast, derivative securities yield returns that depend on additional factors pertaining to the prices of other assets. For example, the payoff to stock options depends on the price of the underlying stock. In our mortgage examples, the derivative mortgage backed securities offer payouts that depend on the original mortgages, which are the primitive securities. Much of the innovation in security design may be viewed as the continual creation of new types of derivative securities from the available set of primitive securities. Derivatives have become an integral part of the investment environment. One use of derivatives, perhaps the primary use, is to hedge risks. However, derivatives also can be used to take highly speculative positions. Moreover, when complex derivatives are misunderstood, firms that believe they are hedging might in fact be increasing their exposure to various sources of risk.
While occasional large losses attract considerable attention, they are in fact the exception to the more common use of derivatives as risk-management tools. Derivatives will continue to play an important role in portfolio management and the financial system. We will return to this topic later in the text. For the time being, however, we direct you to the primer on derivatives in the nearby box.

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Financial Innovation and Derivatives