Glossary
Scarcity heuristic
What is the scarcity heuristic?
The scarcity heuristic is using limited availability as a clue to value. An item can seem more desirable when there are only a few left.
How it works
Lynn's review examines scarcity-related value judgments through commodity theory. That theory concerns items with properties such as usefulness and the ability to be transferred between people. Rarity alone does not make everything desirable.
Scarcity and threatened choice
A separate explanation is psychological reactance: losing an option can make a person want to restore the freedom to choose it. In two experiments by Brehm and colleagues (1966), college students rated four music recordings before choosing one for themselves. The recording ranked third became more attractive when it was removed from the available choices.
This differs from inferring that a rare item has greater value. Under the reactance account, the threatened choice itself matters. It is one proposed explanation for increased desire when access is restricted; these experiments do not show that every low-stock notice produces reactance or increases purchases.
Examples of the scarcity heuristic
A limited edition or restricted access can invite the inference that an offer is valuable because few people can obtain it. That inference needs checking: limited availability does not establish usefulness or quality.
Why it matters
A shop's “Only 3 left” message may get attention, but its effect depends on the product, buyer, credibility, and setting. Test what it does for the actual offer. And if you say only three remain, there should be only three remaining.
This use of scarcity differs from research on lacking money or time.