This program provides an interactive view of the results of the Black-Scholes model for both “call” and “put” options. A call is the right to buy a stock later at a price established now--the “strike price.” A put is the right to sell a stock later at a price established now; it's a bet that the stock price will decline. The program's output is a family of curves; each curve assumes a different time until the expiration of the option. The x-axis represents the price of the stock, and the y-axis represents the price of the option itself--the right to buy or sell. “Minimum S” and “Maximum S” represent, respectively, the lowest and highest values that the stock price can be expected to hit during the lifetime of the option. Similarly, T is the time until the option expires, and “Minimum T” and “Maximum T” allow you to specify a range of values that T can take.