What's a great computer game that teaches you about business transactions and corporations?

I would like to buy a computer game that could teach me information about corporations and how they work. A game that has to deal with entrepreneurship would be great. Something that is very detailed and fun at the same time.What's a great computer game that teaches you about business transactions and corporations?
Years ago, before the days of Windows, there was a game called Lemonade that we played on our Commodore VIC-20 computer. Am extremely simple, text based game. But our kids absolutely LOVED it! I

In each round, the computer gave you the weather forecast, the daily cost of lemons and sugar, and allowed you to place your order for your lemonade stand. It then reported how the weather actually turned out, and how much lemonade you sold. And too, of course, your profits.

Doesn't teach about corporations, but what a fun way to learn about small business!