The principle of equal-value exchange, which stresses equal value in exchange, is a common law in commercial and economic activities.

等价交换原则是商品经济活动领域通行的原则，强调交换的等价性。

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Yes, there is more of something called money put out there in exchange for something of equal value given up voluntarily by individuals or institutions who earned it in exchange for services in the marketplace.

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