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What is Margin call, Leverage and Profit & Loss
Margin Call
When the margin posted in the margin account is below the minimum margin requirement, the broker or exchange issues a margin call. The investors now either have to increase the margin that they have deposited or close out their position. They can do this by selling the securities, options or futures if they are long and by buying them back if they are short. But if they do none of these, then the broker can sell their securities to meet the margin call. If a margin call occurs unexpectedly, it can cause a domino effect of selling which will lead to other margin calls and so forth... Effectively crashing an asset class or group of asset classes.
This situation most frequently happens as a result of an adverse change in the market value of the leveraged asset or contract. It could also happen when the margin requirement is raised, either due to increased volatility or due to legislation. In extreme cases, certain securities may cease to qualify for margin trading; in such a case, the brokerage will require the trader to either fully fund their position, or to liquidate it.
A broker's demand on an investor using margin to deposit additional money or securities so that the margin account is brought up to the minimum maintenance margin. Margin calls occur when a you account value depresses to a value calculated by the broker's particular formula.