Groupon (a portmanteau derived from "group coupon") is a deal-of-the-day website that features discounted gift certificates usable at local or national companies.
The company offers one "Groupon" ("group coupon") per day in each of the markets it serves. The Groupon works as an assurance contract using ThePoint's platform: if a certain number of people sign up for the offer, then the deal becomes available to all; if the predetermined minimum is not met, no one gets the deal that day.
http://en.wikipedia.org/wiki/Grouponso this are a group buyer, a collection person to buy something and create the discount when they reach certain limit so other people would able to buy in same price.
it's very intersting development.
