It appears to be quite difficult to get this to work well in practice.
Just as amateur cyptographic efforts wilt under the scrutiny of experts,
so most floating market schemes disgorge vast amounts of gold to clever
but devious players.
> I might also suggest that cities should not sell goods that can be
> COLLECTed by players, but that's another issue.
In instances where cities do sell items that players can make, I have
tried to make them almost unreasonably expensive, to give the players
plenty of room to undercut the cities.
-- Rich Skrenta <firstname.lastname@example.org>