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A form of payment to a brokerage in which the brokerage receives a percentage of the value of each transaction that a client orders. Commissions are seen as advantageous to a client because if the client does not make orders, then he/she does not have to pay a broker. However, commissions create an incentive for brokers to make as many transactions as possible; this has resulted in the regulation of commissions by the SEC. The percentage of a commission varies by brokerage, with those charging higher commissions offering a wider variety of investment advisory services. Low-commission brokerages usually offer no investment advice and simply fill orders. See also: Fee.