accumulate manufactured products and sell them to final customers (p. 218)

Companies that resell books to the public at or near the retail price. Retailers are generally bookstores, but include any store or organization that sells books. Libraries are also considered retailers in this regard.

sell directly to the consumers.

An operator with no transmission capacity of its own (but who may own switches or other equipment), who buys communication services from other operators and then sells these service to the general public at a profit.

Businesses that buy goods from wholesalers or manufacturers and resell them to customers.

Intermediaries that purchase products and re-sell them to final consumers. p. 142