After the Closing Bell

Once a closing bell signals the end of a day's trading, the exchange's clearing organization matches each purchase made that day with its corresponding sale and tallies each member firm's gains or losses based on that day's price changes--a massive undertaking considering that nearly two-thirds of a million futures contracts are bought and sold on an average day. Each firm, in turn, calculates the gains and losses for each of its customers having futures contracts.

Gains and losses on futures contracts are not only calculated on a daily basis, they are credited and deducted on a daily basis. Thus, if a speculator were to have, say, a $300 profit as a result of the day's price changes, that amount would be immediately credited to his brokerage account and, unless required for other purposes, could be withdrawn. On the other hand, if the day's price changes had resulted in a $300 loss, his account would be immediately debited for that amount.

The process just described is known as a daily cash settlement and is an important feature of futures trading. As will be seen when we discuss margin requirements, it is also the reason a customer who incurs a loss on a futures position may be called on to deposit additional funds to his account.

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Thursday, March 11, 2010