当两个人两情相悦，彼此用爱情做交换，他们就会明确感到爱情的存在，并且很少有经济上的矛盾。
Mutual when two people with each other to do with the exchange of love, they will clearly feel the existence of love, and few of economic contradictions.
在交换经济中，每个人的货币收入同时又是另外某个人的成本。
In an exchange economy everybody's money income is somebody else's cost.
在前人的法律和经济体系中，我们发现，几乎从未有过以个人为单位进行的财富交换。
In forefathers' law and economic system, we find, have nearly never had wealth carried on by individual that is exchanged.
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