In 2015, U.S. GDP was almost

Three factors explain the risk structure of interest rates

A) liquidity, default risk, and the income tax treatment of a security. B) maturity, default risk, and the income tax treatment of a security. C) maturity, liquidity, and the income tax treatment of a security. D) maturity, default risk, and the liquidity of a security.

A difference between biology and economics is that

A) economists use models and biologists use theories. B) biologists often use laboratory methods and economists do less often. C) economics explains events while biology predict events. D) biologists use the scientific method while economists do not.