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  1. Options Pricing: Introduction
  2. Options Pricing: A Review of Basic Terms
  3. Options Pricing: The Basics of Pricing
  4. Options Pricing: Intrinsic Value and Time Value
  5. Options Pricing: Factors That Influence Option Price
  6. Options Pricing: Distinguishing Between Option Premiums and Theoretical Value
  7. Options Pricing: Modeling
  8. Options Pricing: Black-Scholes Model
  9. Options Pricing: Cox-Rubinstein Binomial Option Pricing Model
  10. Options Pricing: Put/Call Parity
  11. Options Pricing: Profit and Loss Diagrams
  12. Options Pricing: The Greeks
  13. Options Pricing: Conclusion

The price, or cost, of an option is an amount of money known as the premium. The buyer pays the premium to the seller in exchange for the right granted by the option. For example, a buyer might pay a seller for the right to purchase 100 shares of stock XYZ at a strike price of $60 on or before May 19. If the position becomes profitable, the buyer will decide to exercise the option; if it does not become profitable, the buyer will let the option expire worthless. The buyer pays the premium so that he or she has the "option" (or the choice) to either exercise or allow the option to expire worthless.

Premiums are priced per share. For example, the premium on an IBM option with a strike price of $172.50 might trade at $2.93, as shown in Figure 1, below. Since equity options are based on 100 stock shares, this particular contract would cost the buyer $2.93 X 100, or $293 dollars. The buyer pays the premium whether or not the option is exercised, and the premium is non-refundable. The seller gets to keep the premium either way.
 

Figure 1 Part of the option chain for the March 2017 IBM contract, which shows some of the premiums and strike prices.

Chart created at CBOE.com.

An option premium is its cost – how much the particular option is worth to the buyer and seller. While supply and demand ultimately determine price, other factors, which will be discussed later in this tutorial, do play a role. Option traders apply these factors to mathematical models to help determine what an option should be worth.


Options Pricing: Intrinsic Value and Time Value
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