Exchanging a dollar for a product means that I value the product more than the dollar. I didn't lose in this trade. Now, if I think the product is overpriced, i

Exchanging a dollar for a product means that I value the product more than the dollar. I didn't lose in this trade. Now, if I think the product is overpriced, in the current market I'd wait for it or a competitor's product to lower its price since prices tend to vary overtime. If the product comes from a monopoly, then you're doomed. Anyhow, the zero-sum game does not apply to the free market.