The document describes three types of business activities:
1) Service businesses that provide services to customers and have no goods inventory, with a shorter operating cycle.
2) Merchandising businesses that buy and sell goods, having only finished goods inventory and a longer operating cycle.
3) Industrial businesses that transform raw materials into finished goods, having raw materials, work-in-process, and finished goods inventory, with restaurants and bakeries as examples. The type of activity relies primarily on the business's main source of revenue.