Consumer-to-consumer (C2C) or citizen-to-citizen.
Electronic commerce involves the electronically-facilitated transactions between consumers through some third party. A common example is the online auction, in which a consumer posts an item for sale and other consumers bid to purchase it; the third party generally charges a flat fee or commission.
The sites are only intermediaries, just there to match consumers. They do not have to check quality of the products being offered. Example of c2c: eBay Craigslist Amazon.com This type of e-commerce is expected to increase in the future because it cuts out the costs of using another company.
An example on cited in Management Information Systems, is for someone having a garage sale to promote their sale via advertising transmitted to the GPS units of cars in the area. This would potentially reach a larger audience than just posting signs around the neighborhood.