The future contracts are negotiated in stock market of futures (Former: BM& FBovespa, CBOT, etc). When the involved ones make a negotiation, define the price for purchase and sales, knowing that the contract is standardized and is related to one determined active one, for ' ' entrega' ' in determined date. On the delivery valley an exception: many assets are not related the physical delivery, then we go to start to speak in expiration of the future contract. Former: Mini future Contract of Dollar. Nobody has that to deliver the amount of dollar or to receive the amount in the date from the expiration, the adjustments and rightness are made financially.
The same it happens with contracts of future (mini or full) of the index of the So Paulo stock exchange. The price of negotiation of the future contract tends to converge to the price of the market the sight (SPOT). A future contract creates an obligation between the involved parts. Who purchase and who vende are obliged to fulfill with its parts in the contract. Thus the two parts can exert its right in the date of maturity. But the parts do not need to take its contracts until the expiration, being able to negotiate its position before the expiration.
To negotiate contracts future an account in one must be had authorized broker for the stock market of futures. The negotiation of future contracts can be made with a part of the value of the negotiated contract, through initial edge and of maintenance, that is defined by the stock market, to give guarantee that who is operating it can fulfill with its part. In such a way, the operator obtains to alavancar its financial position, being able to control contracts, to the times, nine times bigger that its position deposited in the broker (he depends on the Stock market and the contract).