introduction

commodity:-
physical substance, such as food, grains, and metals, which is interchangeable with another product of the same type, and which investors buy or sell, usually through futures contracts

। The price of the commodity is subject to supply and demand.
Risk is actually the reason exchange trading of the basic agricultural products

। For example, a farmer the cost of producing a product ready for market at sometime in the future because he doesn't know what the selling price will be.