Call Options & Put Options Explained(콜 옵션 및 풋 옵션 설명) Option contracts represent a bet on the directional price movement of an underlying stock in a defined time period. Option contracts represent 100 shares of a stock and are written on time frames of weekly, monthly, and yearly. The price of an option contract is based on the probability of it being in-the-money at expiration. The Black-Scholes..