In a free market, which assumes a condition of voluntarism on both sides of an exchange, both sides invariably profit.

This means that no one is ever compelled to trade or exchange anything until in his  judgement (however faulty) he will profit by the exchange in some way or another.

In contrast, labor theory (previously examined) presumes that if one side profits, the other side necessarily loses.

This is a false assumption.  If exchanges are voluntary, no one will voluntarily accept a real loss in terms of his ultimate objectives and perception of value.

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