List the four categories of nonstore retailing and briefly explain each

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Nonstore retailing falls into four major categories:
1. Direct selling, also called multilevel selling and network marketing, involves companies selling door-to-door or at home sales parties.
2. Direct marketing includes telemarketing, television direct-response marketing, and electronic shopping.
3. Automatic vending offers a variety of merchandise, including impulse goods such as soft drinks and other products such as hosiery and cosmetics.
4. A buying service is a storeless retailer serving a specific clientele, usually employees of large organizations, who are entitled to discounts in return for membership.