Assign the students to groups and give them each a business type to manage. This type should be something in the lines of manufacturing, distribution, finance, agriculture and so on; any type of business that will work off other businesses is perfect. Give each business a set amount of mock money and a set period of time in which they are tasked to make a make-believe profit from that money. They then have to work with other businesses in the class to mutually beneficial profiting to complete the project. This will help the students get a handle on the actual act of doing business with others.