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Without further introduction, let us launch in and see what they are. Your text book will have a great deal of detail on each of the Greeks. They also have rather daunting formulae, but it is unlikely that you will be asked to calculate the Greeks except in an intuitive way eg, using the put-call parity. One way to learn about these is to experiment and see how the values of the Greeks changes as different option valuation inputs are changed.

You can use the spreadsheet here deep in the money put option theta has the formulae for the various Greeks built in to play around and discover. It is equal to: For a stock, our proxy in this discussion here for the underlying, delta will be exactly one. Deep in the money put option theta contracts come in packages of shares, so a per share delta of 0. An important thing to remember about delta and in fact all the Greeks is that it is additive when there are multiple securities in a portfolio that carry delta or any other risk expressed by a Greek.

So if we know the delta of either the call or the put, we can calculate the delta of the other. The thing that can be confusing here is that an exam question may ask the delta of a put, or may provide deep in the money put option theta delta of the put, which means the delta of a long put position.

The delta of the short put position would be the negative of that number. An easier way to remember this may be that the sum of the absolute values of the deltas of a call and a put is equal to 1. Call deltas can be interpreted as the probability of the option finishing in-the-money. For this reason, a deep in-the-money option will have a delta close to 1, and a deep out-of-the-money option will have a delta close to 0. The following graphs demonstrate how call and put deltas behave as the price of the underlying changes.

These reflect long positions, and it should be easy to visualize the behavior of the delta of short positions too using these graphs. Delta and time to expiry Gamma. If delta is like a first derivative of the option value with respect to the price, gamma is the second derivative. It measures the rate of change in the delta as a result of changes in the price of the underlying. A positive gamma means delta increases with an increase in price, and negative gamma means the opposite.

A gamma of 0. Again, since options trade in lots ofthe gamma here would be referred to as 8 and not 0. Have no gamma, ie zero gamma. For a deep in-the-money option, delta approaches 1 and gamma approaches zero. Similarly delta for far out-of-the-money options will be close to zero as delta is already zero. Calls and puts have different deltas recall that the sum of their absolute values is 1. However, they have the same gamma for the same option.

This is intuitive if you think about the put-call parity: Now the stock has a linear payoff, and gamma is zero as the second derivative is zero. Thus call gamma deep in the money put option theta put gamma will be identical. Gamma is maximum at or near the exercise price, ie it is maximum when the option is at-the-money.

Theta measures time decay. Extrinsic value is driven by the fact that the value of the underlying is volatile, and the greater the time to expiry the greater the possibilities for the ultimate stock price and therefore greater the risk, justifying a higher value. As an option gets closer to expiration, extrinsic value diminishes and only intrinsic value tends to remain. At expiration, intrinsic value is the only valuable thing left in the option.

Be careful about whether theta is daily or annual — generally option valuation formulae give an annual theta number which needs to be divided by the number of days in the year to get a daily value. Theta is a measure of the amount lost per time period a day, a yearall other things remaining constant. By convention, thetas are negative as they indicate a loss of value. So a theta of 0. Theta would be positive for option sellers as they would benefit from the passage of time and the decline in the value of the option for which they have already received a premium.

Remember that a negative theta means that you lose money with the passage of time if the underlying or other factors affecting the option price do not move. Rho measures the sensitivity of option prices to changes in interest rates. Normally, the effect of rho pales in comparison to delta or theta. Rho is positive for calls, and negative for puts. This is intuitive as call values deep in the money put option theta go up as the interest rates go up as a call is the equivalent buying stock on borrowed money, and the interest which is deep in the money put option theta part of the option value goes up as a result of the increase in rates.

It is negative for puts for exactly the opposite reason as a put is equivalent to selling stock short without receiving the proceeds, and with rising interest rates you can earn more interest on lent money outside, thus making the put less attractive.

Vega is higher the further away we are from the exercise date. Vega is zero for the underlying, for any changes in volatility do not affect the price. Positive delta means that both the option value and the underlying move in the same direction Negative delta means that the option value and the underlying move in opposite directions. Long calls have positive delta, and long puts have negative delta. By extension, short calls have negative delta, and short puts have positive delta.

Delta is additive An important thing to remember about delta and in fact all the Greeks is that deep in the money put option theta is additive when there are multiple securities in a portfolio that carry delta or any other risk expressed by a Greek. Theta Theta measures time decay. Rho Rho measures the sensitivity of option prices to changes in interest rates.

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