NOVEL SHORT-TERM OPTION TRADING SYSTEM

Option contracts are traded by valuing an option that has at least one of a) strike price or b) expiration time unknown at the time the option is valued. The previously unknown values of the option are assigned at the time or after the time the trade is completed. An implied underlying price stream is generated from the option prices through the use of feed back between market participants and the marketplace. The resulting system is useful in trading option contracts of short time duration.