SDIA definition

Wikipedia defines a commodity as following:
Inย economics, aย commodityย is an economicย good, usually aย resource, that has full or substantialย fungibility: that is, theย marketย treats instances of the good as equivalent or nearly so with no regard to whoย producedย them.
The price of a commodity good is typically determined as a function of its market as a whole: well-established physical commodities have actively tradedย spotย andย derivativeย markets. The wide availability of commodities typically leads to smallerย profit marginsย and diminishes the importance of factors (such asย brand name) other than price.

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