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Option Greeks

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Option Greeks
When learning Option Greeks there are four words you need to know. These words are delta, gamma, theta and Vega. Option Greeks are measurements of risk that explain several variables that influence option prices.
Before we can begin understanding what Option Greeks are, we should first understand the factors which influence the change in the price of an option. Then we can better understand how this fits in with the Option Greeks.
Here are the 3 main factors that influence the change in the price of an option:
Volatility Amount
If you are long in the option, increases in volatility are normally positive for both calls and puts. However, an increase in volatility is typically negative if you are the writer of the option.
Changes in the time to expiration
If an option gets nearer to the expiration time it will become more and more negative and the profit potential will be become less and less. The nearer the option is to expiration, the faster the time value evaporates.
Another way of saying this is that the rate of loss of time value for an option with three months left to expiration is faster than that of an option with six months remaining.
Time is running out for the option to get in-the-money (when the strike price is less than the market price of the underlying security). The less time, the less value. The closer and closer options get to expiration, the less chance there is that it will happen, and there are generally fewer buyers and more sellers.

When the underlying asset changes in price
If a holder of an option has a call option, an increase in the price of the underlying asset is typically a positive situation. If you have a put option and there is a decrease in the price of the underlying instrument this is typically a positive situation.
There is another influence which is interest rates. A lot of the time these are less

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