A business model represents a group of common characteristics and methods of doing business to ___(1)___ sales revenues and reduce ___(2)___. B2B and B2C are the two most popular e-business models. Dell, as a B2B business firm, builds only what is ordered from ___(3)___ who are looking for ___(4)___, high-quality computer products, thus eliminating costs associated with ___(5)___ and retailers. Different from B2B firms, B2C firms often attempt to build long-term relationships with their ___(6)___. Tracking the decisions and ___(7)___ as customers surf a website helps management to provide ___(8)___ to its customers. Since the beginning of commercial activity on the Internet, developments in e-business have been rapid and ___(9)___. The number of Internet users in the world is expected to increase ___(10)___.