Ekonos.
Ekonos is a game with simple rules and easy to play. It simulates the functions of the stock market by providing companies with a tangible value. Besides being a didactic tool, Ekonos is highly entertaining.
Learning to play Ekonos is simple and does not require any previous knowledge of economics. Ekonos is a smart way to spend about 1 hour for 3 to 6 players.
Here you have the game ready to print and play with English (and Spanish) rules.
The instructions to do it yourself are here.
For those who do not have time, you can buy it already made in ludic.net.