Variation Margin - Funds a broker must request from the client to have the required margin deposited. The term usually refers to additional funds that must be deposited as a result of unfavorable price movements.
The VIX or Volatility Index – Shows the market's expectation of 30 – day volatility. It is constructed using the implied volatilities of a wide range of S&P 500 index options. The VIX is a widely used measure of market risk and is often referred to as the "investor fear gauge".
Volatility (Vol) - A statistical measure of a market's price movements over time.
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