In finance, a derivative is a special type of contract. In it, the two parties agree to sell (or to buy) certain goods, at a given price, on a given date. Derivatives can be used as an instrument of speculation: One party "bets" that the price of a certain good will be at a certain level, on a given date. The other option is to use them as a form of insurance, which is also called hedge. One of the oldest derivatives is rice futures, which have been traded on the Dojima Rice Exchange since the eighteenth century.
- Kaori Suzuki and David Turner (December 10, 2005). "Sensitive politics over Japan's staple crop delays rice futures plan". The Financial Times. http://www.ft.com/cms/s/0/d9f45d80-6922-11da-bd30-0000779e2340.html. Retrieved October 23, 2010.