Part of the "Economics USA" series. In response to rising interest rates in the 1970s, the Maryland legislature raised usury ceilings so that more home loans would be available. Also, in December of 1980, Apple Computers went public, affirming four years of hard work with substantial compensation for its founders. Finally, pharmaceutical companies invest millions in bringing new drugs to market. How much profit do they get in return? These stories exhibit economic reasons for interest payments and how investments in facilities and equipment are related to interest rates and expected profits on investment.