C2C
n. Consumer-to-consumer; describes transactions in which a consumer sells a service or product directly to another consumer.

Example Citations:
B2B transactions are easily distinguishable from business-to-consumer, or B2C, such as someone’s buying a book on Amazon.com. An example of C2C commerce? Why, online auctioneer eBay.“
—Don Knox, ”It’s Y2K, so B2B is where it’s @,“ Orange County Register, March 27, 2000

In the parlance of the Valley, Web sites that let you swap your old junk with other people’s are known as C2C goods-bartering sites. (For the English-speaking, that’s “consumer-to-consumer.”)
—“’I’ll Trade You Duran Duran for Michael Bolton’,” Newsweek, April 24, 2000

Earliest Citation:
There are all kinds of possible combinations: b2c, c2c, b2g. B is, of course, for business. C is for consumers. G is government.
—Kevin Maney, “Venture capitalists eat up alphabet soup,” USA Today, September 15, 1999

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