This is called the bandwagon effect when it depends on the psychology of buying a product because it seems popular, or the network effect when a large number of buyers or users itself increases the value of a good. For example, as the number of people with telephones or Facebook accounts increased, the value of having a telephone or Facebook account increased, because the user could reach more people. However, neither of these effects suggests that, at a given level of saturation, raising the price would boost demand.