forex : the foreign exchange market is a worldwide for buying and selling currencies. It handles a huge volume of transactions 24 hours a day, 5 days a week. Daily exchanges are worth approximately $2.6 trillion .
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stocks : it opens only a few hours a day, and there is a commission in every trade
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Future :
Futures is Exchange traded contracts are not issued like securities, short). In the beginning there are no contracts, so the number of long contracts must equal the number of short contracts. This always goes through the exchange, which means that the exchange is the counter party for all trades. However, the exchange does not take any net positions. >>