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。
Marginal user cost----The user cost of the last unit of resource.
边际使用者成本——使用者最后一单位资源成本。
Marginal opportunity cost — the additional cost of providing the last unit of good as measured by what is given up.
边际机会成本——提供最后一单元商品的额外成本，慎重的做出放弃什么。
Because adding to positions changes the total cost of the entire position on a per-unit basis toward the last price, a quick reversal to the original entry price can result in a significant loss.
因为加仓改变了整个仓位的成本，每个单位的成本都会走向最后的价格，快速的价格反转会带来巨大的亏损。
Because adding to positions changes the total cost of the entire position on a per-unit basis toward the last price, a quick reversal to the original entry price can result in a significant loss.
因为加仓改变了整个仓位的成本，每个单位的成本都会走向最后的价格，快速的价格反转会带来巨大的亏损。
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