A method is provided for fulfilling a pair trade request and includes the steps of receiving a plurality of pair trade requests; executing a transaction for a first portion of one of the plurality of pair trade requests and matching a second portion of the one of the plurality of pair trade requests...http://www.google.com.tw/patents/US7769677?utm_source=gb-gplus-share專利 US7769677 - Pair trading system and method
