Most US brokers offer their clients the opportunity to operate a margin account. Margin is a loan from your broker which is secured on the stocks in your account and on those you buy with the money loaned. There is a maximum depending on the asset class against which you borrow.
Using margin may be attractive in a rising market - in effect, it allows you to invest more capital than you actually own - but it can be perilous in a falling market, especially for those who lack back-up resources. The reason for this is the 'margin call'. This is the demand which your broker is entitled to make that you post additional collateral (i.e. cash, bonds or other securities) to restore your margin account to the approved percentage value of the assets in question.
Most margin calls require you to take action within 24 hours. If you don't have any assets to post as collateral, your broker is allowed to sell stocks in your margin account to rebalance the position. As, typically, this would happen in a falling market, you may get poor prices for the stocks being sold.
So, in general, margin should be used with caution, and brokers are as keen as anyone that their clients use it sensibly. It's not in their interests for their clients to get into financial difficulties. The following rules of thumb are worth noting:
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