An illegal, fraudulent scheme in which a con artist contrives victims to invest by promising an extraordinary return but simply uses newly invested funds to pay off any investors who insist on terminating their investment.
The relationship between the price of a put and the price of a call on the same underlying security with the same expiration date, which prevents arbitrage opportunities. Holding the stock and buying a put will deliver the exact payoff as buying one call and investing the present value (PV) of the exercise price. The call value equals C=S+P-PV(k).
This security gives investors the right to sell (or put) fixed number of shares at a fixed price within a given time frame. An investor, for example, might wish to have the right to sell shares of a stock at a certain price by a certain time in order to protect, or hedge, an existing investment.