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At its most basic level, Theta is the rate of decay an options price experiences over time. Keep in mind Theta is not constant and the rate of decay will tend to increase as expiration nears.
Also, keep in mind that although each greek references a certain aspect of options pricing they need to all be thought of in the sense of 'all things being equal' and 'at this exact moment'. In other words as price, time or volatility etc change, so too do the greeks.
Here's some more info: Theta
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