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How does investing in commodities/futures vary from stocks?
As Dilip has pointed out in the comment, investing in commodities is to either delivery or Buy. Lets say you entered into buying "X" quantities of Soybeans in November, contract is entered into May. In November, if the price is higher than what you purchased for, you can easily sell this, and make money. If in November, the price is lower than your contract price, you have an option to sell it at loss. If you don't want to sell it at loss, you are supposed to take the physical shipment [arrange for your own transport] and store it in warehouse. Although there are companies that will allow you to lease their warehouse, it very soon becomes more loss making proposition. By doing this you can HOLD onto as long as you want [or as long as the good survive and don't rot] It makes sense for a large wholesaler to enter into Buy contracts as he would be like to get known prices for at least half the stock he needs. Similarly large farmers / co-operative societies need to enter into Sell contracts so that they are safeguarded against price fluctuations.