What determines the price for a gallon of gas or an ounce of gold?
In part, the commodity markets.
From precious metals and currencies to wheat, soybean and corn, traders buy and sell a wide variety of commodities.
If you'd like to understand how commodity trading works, you might visit one of these locations on the World Wide Web:
CME GROUP:
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http://www.cmegroup.com/education/product-specific/the-basics.html
Features a wide range of educational information and specific products about futures trading.
COMMODITY FUTURES TRADING COMMISSION:
http://www.cftc.gov/ConsumerProtection/EducationCenter/index.htm
Offers futures markets basics and commodity trading guidelines.
FINANCIAL WEB:
http://www.finweb.com/investing/how-do-investors-usually-profit-in-the-c...
Discusses ways investors can profit from commodities, along with related topics.
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INVESTOPEDIA:
http://www.investopedia.com/terms/c/commodity.asp
Provides basic definition of a commodity. Check out the list under "Related Terms" to find more information on futures trading.