做交易就是试错，错了砍，对了拿，做任何一行都有成本，卖包子还有个面粉成本，做交易的成本是什么？我们要知道最高点和最低点不是用来进场的，那是神仙干的事，我们只能找次低点或次高点相对于最低点或最高点的距离进场，这段距离就是交易的成本，也是最廉价成本，我们进场考虑的先不是赚钱，而是先衡量成本大小，再决定买卖，进场就要做最坏的打算。
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