In the instance of the scarcity principle, that power comes from two major sources. The first is familiar. Like the other weapons of influence, the scarcity principle trades on our weakness for shortcuts. The weakness is, as before, an enlightened one. In this case, because we know that the things that are difficult to possess are typically better than those that are easy to possess, we can often use an item’s availability to help us quickly and correctly decide on its quality. Thus, one reason for the potency of the scarcity principle is that, by following it, we are usually and efficiently
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