他們為什麼在交易場所需要錢?


1

所以我知道交易場所結束時發生了什麼(承諾以142賣出OJ,然後在價格下跌時以29買入)

但是,如果您沒有現金就可以買東西或做出購買承諾,為什麼在開始交易之前從他人那裡獲取現金很重要?

1

The clearinghouse requires that all traders post margin. Otherwise, everybody would be able to trade in infinite size and the losers would not be able to make good on their bets.