STANDARD AND POORS Definition

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STANDARD AND POORS (S&P) 500 is an index of the 500 largest, most actively traded stocks on the New York Stock Exchange. It provides a guide to the overall health of the US stock market.

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SHARPE RATIO, named after William P. Sharpe, is a measurement of portfolio trading performance. It is calculated by subtracting risk free rate from total portfolio return, then dividing by the standard deviation of the portfolio:Sharpe ratio = Total portfolio return - Risk free rate / Portfolio standard deviation.

SAFETY STOCK (SS) or security stock ensures that the item is available up to the pre-defined required service level, even when the re-ordered material arrives later then expected, or the fluctuations in demand during the lead-time cause the demand to be larger then expected. See also STOCK RESERVE.

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