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Time component of an option

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Time decay is a measure of the rate of decline in the value of an options contract due to the passage of time. Time decay accelerates as an option's time to expiration draws closer since there's less time to realize a profit from the trade. Time decay is also called theta and is known as one of the options Greeks. Other Greeks include delta, gamma, vega, and rho, and these formulas help you assess the risks inherent with an options trade. An option's time value is how much time plays into the value—or the premium—for the option.

You can't price an option until you know what makes up its value. An options top 10 options can become a complex machine of legs, multiple orders, adjustments, and Greeks, but if you don't know the fundamentals then what are you trying to accomplish?

When you look at an option chain have you ever wondered how they generated all those prices for the options? These options are not created by random but instead calculated out using a model such as the Black-Scholes Model.

We will dive deeper into the seven components of the Black-Scholes Model and how and why they are used to derive an option's price. Like all models, the Black-Scholes Model does have a weakness and is far from perfect.

7 Factors That Affect An Option's Price - The Option Prophet

It was developed by Fisher Black and Myron Scholes as a way to estimate the price of an option over time. Robert Merton later published a follow-up paper further expanding the understanding of the model.

Remember that an options contract is only the right to own shares, but this right is time sensitive.

Merton is credited for naming the model "Black-Scholes. Fisher Black was not eligible because the Nobel Prize cannot time component of an option awarded posthumously. As with any model, some assumptions have to be understood. The rate of return on the riskless asset is constant The underlying follows the more the option will be worth which states that move in a random and unpredictable path There is no arbitrage, riskless profit, opportunity It is possible to borrow and lend any amount of money at the riskless rate It is possible to time component of an option or short any amount of stock There are no fees or cost There are seven factors in the model: stock price, strike price, type of option, time to expiration, interest rates, dividends and future volatility.

Of the seven factors, only one is not known with any certainty: future volatility.

Time Decay Definition

This is the main area where the model can skew the results. Stock Price If a call option allows you to buy a stock at a specified price in the future than the higher that price goes, the more the option will be worth. In this situation, our option value will be higher.

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Strike Price Strike price follows along the same lines as stock price. When we classify strikes, we do it as in-the-money, at-the-money or out-of-the-money.

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When a call option is in-the-money, it means the stock price is higher than the strike price. When a call bitcoin every day out-of-the-money, the stock price is less than the strike price.

On the flip time component of an option of that coin, a put option is in-the-money when the stock price is less than the strike price. A put option is out-of-the-money when the stock price is higher than the strike price. Options that are in-the-money have a higher value compared to options that are out-of-the-money.

Type Of Option This is probably the easiest factor to understand. An option is either a put or a call, and the value of the option will change accordingly.

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A call option gives the holder the right to buy the underlying at a specified price within a specific time period. A put option gives the holder the right to sell the underlying at a specified price within a specific time period. If you are long a call or short a put your option value increases as the market moves higher. If you are long a put or short a call your option value increases as the market moves lower.

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Time To Expiration Options have a limited lifespan thus their value is affected by the passing of time. As the time to expiration increases the value of the option increases. As the time to expiration gets closer the value of the option begins to decrease. The value begins to rapidly decrease within the last thirty days of an option's life. The more time an option has till expiration, the more time the option has to move around.

Time Decay

Interest Rates Interest rates have a minimal effect on an option's value. When interest rates rise a call option's value will also rise, and a put option's value will fall. Plus we will have the same reward potential for half the risk. Now we can take that extra cash and invest it elsewhere such as Treasury Bills. This would generate a guaranteed return on top of our investment in TOP. The higher the interest rate, the more attractive the second option becomes.

Thus, when interest rates go up, calls are a better investment, so their price also increases. On the flip side of that coin if we look at a long put versus a long call, we can see a disadvantage.

We have two options when we want to play an underlying to the downside.

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You can short shares of the stock which would generate cash into the brokerage and allow us to earn interest on that cash. You long a put which will cost you less money overall but not put extra cash into your brokerage that generates interest income.

The higher the interest rate, the more attractive the first option becomes. Thus, when interest rates rise the value of put options drops. Dividends Options do not receive dividends, so their value fluctuates when dividends are released. When a company releases dividends, time component of an option have an ex-dividend date.

If you own the stock on that date, you will be awarded the dividend. Also on this date, the value of the stock will decrease by the amount of dividend.

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As dividends increase a put option's value also increases and a calls' value decreases. Volatility Volatility is the only estimated factor in this model. The volatility that is used is forward volatility.

Components of an Option

Forward volatility is the measure of implied volatility over a period in the future. Implied volatility shows the "implied" movement in a stock's future volatility. It tells you how traders think the stock will move. Implied volatility is always expressed as a percentage, non-directional and on an annual basis.

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The higher the implied volatility, the more people think the stock's price will move. Stocks listed on the Dow Jones are value stocks, so a lot of movement is not expected. Thus, they have lower implied volatility. Growth stocks or small caps found on the Russellconversely, are expected to move around a lot, so they carry higher implied volatility.

Conclusion The Black-Scholes Model is used to derive an option's value. While there are many assumptions in the equation, the Black-Scholes Model is still the most widely used model. Its time component of an option of calculation and useful approximation create a strong basis to build more complex models.

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Out of the seven factors volatility is the only one that is estimated. Out of the seven factors, the most important are stock price, strike price, type of time component of an option, time to expiration and volatility. Interest rates and dividends have a very minuscule effect on an option's value.