What are online purchasing groups (Buyer Aggregator)? The model is that of the purchase groups, but in this case, the product or service is offered at discounted prices only in the event that a fixed minimum number of participants is reached.

With this e-commerce system, it will therefore be in the interest of the user himself to disseminate as much as possible the offer of online sales, to reach the minimum number of people needed to take advantage of heavily discounted prices before the deadline. The mechanism is very simple: just register on the site, buy the offer (via Paypal or credit card), but the money will be scaled only if and when the minimum number of adhesions is reached. At that point there is the real online sale, as the promotion starts and you receive by email a coupon with a code generated by the system, to be presented directly to the managers of the activity that has joined the initiative. Collective buying groups are the novelty of online sales and are expanding virally. In fact, there are already several portals that are based on this e-commerce system using coupon or voucher promotions.