Options Trading Explained: Sell to Open, Buy to Close:(옵션 거래 설명: 오픈에 판매, 마감에 구매:) Options are interchangeable financial contracts that give the buyer the right to call or put a stock or commodity on someone based on the strike price and the underlier. Options contracts are are not assets like bonds that own debt or stocks that are ownership of equity in a company. they are more bets on a price b..