“As a result, capital has flowed more freely across national borders in search of the highest risk-adjusted rates of return,” he said.
Greenspan said the marriage of derivatives and securitisation techniques in the form of synthetic collateralised debt obligations (CDOs) has broadened the range of investors willing to provide credit protection, by pooling and unbundling credit risk through the creation of securities that best fit their preferences for risk and return.
Greenspan highlighted Argentina’s recent default as a “powerful test” of credit derivatives that “proved their worth, even helping to limit contagion”.
On Monday, influential investor Warren Buffett, in a letter to his investment and insurance company Berkshire Hathaway shareholders, described derivatives as “weapons of mass destruction, carrying dangers that, while now latent, are potentially lethal”. He said large amounts of risk, particularly credit risk, have become concentrated in the hands of relatively few derivatives dealers that trade extensively with each another.
Greenspan added that further development of derivatives markets, especially in smaller economies, is likely to facilitate greater cross-border flows and a more productive distribution of global savings. “The coincident development of local derivatives markets may facilitate the development of local currency bond markets in small or emerging market economies by giving foreign and domestic investors more tools to hedge their exposure to the country risk,” he said.