PRINCIPAL is: a. a person who has controlling authority (e.g. the CEO or owner of a company) or is in a leading position (part owners of a legal entity) or, b. a matter or thing of primary importance, e.g. is the amount of a loan, excluding interest, or the amount you invest, excluding income.
MARGIN CALL (Stocks) is a demand for additional funds because of adverse price movement is a stock.
AT THE MONEY is an option where the strike price is approximately equal to the underlying price.
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