许多使用多重系统的商品交易顾问（CTA）通常只建立净头寸，其中有些人能同时轻松的使用50种以上的系统。
The large CTAs who are trading multiple systems usually trade net positions and some of them easily operate 50 or more systems at a time.
商品交易顾问，也叫做管理期货基金，就是靠利用这种现象生存的。
Commodity trading advisers (CTAs), also known as managed futures funds, exist to exploit the phenomenon.
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