If you buy 1kg mango you will need to pay more but if you buy 10kgs of mango you can get mega discount.but the problem is that you can not consume 10kg mango. here is the situation when we come into picture.we find the same like minded people interested in same kind of mango and make a group of them.we then go to the seller and ask for a group discount. This brings a win-win situation to both buyers and sellers as buyers get discount and seller get finance in one go.