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<p>[QUOTE=&quot;Heliodromus, post: 7816395, member: 120820&quot;]Yes, but that quadruple-coincidence makes it sound a bit more unlikely than it probably is, especially since only one side of the trade is likely fixed ...</p><p><br /></p><p>What happens in practice is that A spots a coin (the &quot;fixed&quot; one) in B&#039;s collection that they want, and asks B if they&#039;d be willing to sell/trade it. B may not be willing to sell (valuing the coin, due to rarity or whatever, above any reasonable offer), but might be open to the right trade ... after all why close the door to unknown possibilities.</p><p><br /></p><p>So now it &quot;just&quot; comes down to does A have something to offer that tempts B enough to do the trade. There is likely considerable flexibility on the part of A since they want to make the trade happen. The win-win value perception can come from a bunch of different factors, including different interests, prices paid, etc.[/QUOTE]</p><p><br /></p>

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