人们太在意纾困的直接成本了。
To figure that out, one has to read lower in the footnote, which says that referral-fee revenues' have minimal corresponding direct cost of revenue. '.要想弄明白这一点，人们就必须再去研究下方的脚注，上面说推荐费收入的直接成本极低。
As before, market forces cause production to expand until the seller's direct cost for the last unit sold is exactly the value of that unit to the buyer.在一个简单的市场模型中，市场的力量将促使生产者扩大生产，直到消费者愿意支付的价格等于生产者的直接生产成本为止。
