[mattchew]

It's pretty dated at this point (and I don't know of anything recent like it), but playing M.U.L.E. is a little education in microeconomics all by itself.

https://en.wikipedia.org/wiki/M.U.L.E.

Ok, I see that Planet M.U.L.E. is a recent remake that may actually be alive and kicking, good deal!

http://www.planetmule.com/

[mysterydip]

That was a great couch competitive game. Trying to goad a player into bidding more than necessary for something they needed before they turned around and stuck you with it was good fun.