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InvestHub.com's
Finance Dictionary and Glossary of Investment Terms

Contagion  

Definition 1.

Excess correlation of equity or bond returns. For example, under usual conditions we might observe a certain level of correlation of market returns. A period of contagion would be associated with much higher-than-expected correlation. Some examples are the conjectured contagion in East Asian markets beginning in July 1997 when the Thai currency devalued and the impact across many emerging markets of the Russian default. Contagion is difficult to identify because you need some sort of measure of the expected correlation. It is complicated because correlations are known to change through time, for example, see Erb, Harvey and Viskanta's article in the 1994 Financial Analysts Journal. In periods of negative returns, correlations (and volatility) are known to increase, so what might appear to be excessive may not be contagion.
 

Definition 2.

When an economic crisis in one country's bond or equity markets spreads to other countries which experience the same problems. The term comes from the more general definition of contagion, which is a highly transmittable disease.
 
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