Options: Understanding the Greeks

Thursday, October 7, 2010

Why is it that the purchase of options appear to have their own language that is different from all other financial markets; financial markets have their own dialect that traders know exactly what they are talking about when they talk with other traders. This comes from the "old days" when the financial transactions were all carried out either face-to-face one deck Exchange or over the telephone.

Options market is somewhat different, because pricing options derived from the relatively high level mathematics. Key pricing tool on the market of options is the Black-Scholes model options pricing model, which was developed in 1973 by Fischer black and Myron Scholes model.Black Scholes model is a mathematician and Economist. this model uses differential equations to describe pricing models for derivative instruments and is mainly used in the options market.

Mathematics using "Greeks" to determine the pricing variables such as price and expiration.While there is a long series of the Greeks, the only ones who need the average trader to know about is Delta, Theta, Vega, and Gamma. do not worry, as it will appear below, these are little more than simple ideas that should be understood. We will not be through the calculations of these concepts, there are many systems that automatically calculates this.

Delta is the measurement of change in the price of options resulting from a change in the price of the underlying. in short, the issue, if the underlying asset price moves from 5% How would that affect the option values is an issue of Delta. As expected, if the value of the underlying instrument, a call about security would be worth more. Obviously put options have a negative difference with the underlying value, such as an increase in the underlying makes placing cheaper.

Similarly, the gamma of an option is the rate of change of the Delta.Gamma deals not with the actual change in relation to the fluctuation of price options, but the pace of change.As expected, the further the money that the option is, or more, the end time, less variability in underlying will have the option to also note that Gamma is positive for long options positions and negative for positions over its short options.

The Theta selection shows the impact of decay time for an option.This removes the intrinsic value of the option (the value issued by the underlying value of assets) and focuses on the other hand the extrinsic value, or the time decay. Theta an option increases as the option expiration approaches, such as the time the value of the option reduces and is replaced or exceeded by the value associated with the invoice from the underlying security.

The last (and less common) of the Greeks in options trading is Vega, which is the main "risk" measure of a selection. Vega says trader how an option will increase the price decrease is due to an increase in the drop Inn implied volatility. Vega moved with animations with implied volatility option. it is interesting to note that the option buyers benefit from increased volatility and the option sellers benefit from reduction of implied volatility.

While this article may be difficult to read the first time around, I urge any potential options trader to reread, focusing mainly on Delta and gamma. Understanding, at least a basic level of these four major Greeks will improve not only your knowledge of animation options pricing, but we are sure that eventually will also improve your transactions.


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