在玩自由市场时，卖者可以开价，买者可以还价，双方讨价还价后成交。
Playing the free market, sellers can offer, the buyer can counter-offer, the two sides after the contract bargaining.
你挑了一个小木雕，在经过长达半个小时的讨价还价后，你只付了对方开价的四分之一的价钱。
You bought a small wooden statue and after arguing for half an hour you paid only a quarter of what the man was asking.
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