By the time that mr carey became chairman , the dynamics of the rivalry between the two was changing as the merc achieved a stock market listing .
到凯里成为董事长时，由于芝加哥商业交易所已完成股票上市，两者之间的敌对状态出现了改变。
New york merc works on an open outcry system .
纽约商业交易所建立在一个敞开的大声呼喊的系统。
But in 1972 , mr melamed pioneered the launch of the world 's first futures contract that was not based on an agricultural commodity such as pork bellies at the merc , or grains at the cbot : a future on foreign currencies .
