In order to qualify for the bonus, the referrer must have an active One Financial Markets trading account with a minimum account balance of $500.

为了有资格获得奖金，推荐人必须有一个活跃的One Financial Markets的交易账户，并且最低账户余额达到500美元。

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Regulators say holding back a small amount of customer cash would decrease the amount of capital that firms would have to hold in reserve and compare the idea to a minimum account balance required by banks.

WSJ: U.S. Sets Money-Market Plan

If Mr. Market trashes your investments in a sudden panic, your margin debts may be "called, " forcing you to sell some of your assets to sustain the minimum account values you committed to under the terms of the loan.

WSJ: The Intelligent Investor: Borrowing Against Yourself

Clients often equate a higher level of service with a higher account minimum, people in the industry say.

WSJ: Do You Make the Asset Cut?