Don't know how much this helps, but I played a game called Capitalism II,
it features a pretty extensive economy system with corporations that compete for certain goals (highest market share in electronics, etc.). You can mine resources, build factories to craft the resources into goods, build retails to sell the goods (you can also sell your competitions goods if they allow it). You can set prices on pretty much everything, buy shares of company, take over companies, etc.
This is just if you need some more inspiration ;), cheers