I don't like suggesting that you should play more computer games, but I read about EVE Online. It's an online muliplayer role-playing game. Personally, it's too much money to start spending on games. It does look at economies and how prices, supply and demand change over time. Apparently there are a lot of executives who play it. If anyone does play, I'd be interested to know what you think about it all:
http://news.bbc.co.uk/1/hi/technology/7256069.stm
http://www.eve-online.com/
