GroupGain | 80GB iPod

The item’s bucket has a fixed price. No matter how many people join the bucket, the price will stay the same.

The item’s bucket has an ever-increasing price dependant on the number of people who join the bucket. The seller sets a certain amount by which the price will increase every time a certain amount of people joins the bucket.
Ex: Starting price: $100. For every 5 people that join: +$5. If 50 people join, the next five people will have to pay $150 for the product.

This means that the item’s bucket has an ever-decreasing price dependant on the number of people who join a bucket. The seller sets a certain amount by which the price will decrease every time a certain amount of people joins the bucket.
Ex: Starting price: $100. For every 5 people that join: -$5. If 50 people join, the next five people will have to pay $50 for the product.

This means that the price will go down by a certain amount at the end of the deal, depending on the number of buyers. This is the only bucket that is always successful, no matter how many people join it. As with the Minus Bucket, the price can only go down, but unlike that bucket, the entire group benefits from the lowest price possible depending on the number of people who join the bucket.
Ex. Range: $100-$200. 50 people desired. Price decreases by $2 per every additional Buyer.

This is a bucket that was started by another buyer and sellers are currently competing over for the lowest price. See What is ‘Buyer Power’? for more information.