Generally speaking, an option contract with 100 days until expiration is more valuable than an option contract with ten days until expiration. The price of time, therefore, is influenced by
various factors in the market, such as the number of remaining days until expiration, current stock price,
current strike price, and interest rates, but none of these areas significant as implied volatility. Implied volatility is the only element or piece of an option's Extrinsic Value that is "unknown" or "estimated" by the market. Another fancy way of saying "estimated" in finance is to use the word implied. If you think about it fora second, you w know the factors that contribute to the time premium of any options contract. What we will not know is the volatility of the stock in the future. We will always be able to calculate how many days are remaining until expiration. We also always know the stock price relative to its strike price or the option's intrinsic value. And, we can lookup the current long-term interest rates. The ONLY data point in an option’s price we don't know for certain is how volatile the stock will be in the future We can look back and seethe historical
volatility of a stock, but to know what will happen in the future would require a time machine Will the stock move 20% per year on average Will it move more than 20%? Will it move less than 20%?
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We will never know this for certain, but what we can do is estimate it's future volatility. In simple terms, implied volatility is calculated by taking an option’s
current price, and shows what the market feels or implies about the stock’s volatility in the future. Its based on the pricing from a combination of at-the-money and out-of-the-money calls and puts on both sides. In other words, the market itself determines expected or implied volatility through the activity of the investors like you and me placing trades.
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