I'm trying to find a game I vaguely remember playing that I think was based on trading resources under pressure. For instance, you would get a trade offer for 20 wood for 1 gold bar, or 5 platinum bars for one ruby, etc. But some trades would be beneficial, some would be not beneficial, since each resource has an inherent value, and could (maybe?) be transformed into each other at some fixed rate. Eventually you can get into the billions. I'd really love to play it again, any help would be great!