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<p>[QUOTE=&quot;Tejas, post: 7816793, member: 84905&quot;]But that is still exactly the situation that I described before. It doesn&#039;t matter if A wants B&#039;s coin more than the other way round. All that matters is that A values possession of B&#039;s coin more than possession of his own coin and vice versa. If the condition is met the two can conduct a mutually beneficial exchange. Most of the time the condition is not met, which is why we use money instead. </p><p><br /></p><p>This condition also does not exclude error. If A changes his mind after the trade - maybe because a much better deal came up in an auction - his consumer surplus (not consumer rent - I mixed English and German earlier) drops, perhaps into negative. </p><p><br /></p><p>PS happened to me recently. I bought a Qarter-Siliqua of Athalaric without the REX title in an auction. The coin was in poor condition, but since it is extremely rare I thought I&#039;ll never get a second chance. Yet, within two months a second, better one came up (which I also bought). My appreciation of the first one is pretty low.[/QUOTE]</p><p><br /></p>

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