Scarcity
Things that are running out feel more valuable than things that are not.
What it is
Limited supply, limited time and limited access all raise perceived value and speed up decisions. The effect is strongest when the scarcity is real and the reason is clear. Fake countdowns and permanent "only 3 left" badges train people to ignore you.
The research
Participants rated cookies from a jar containing two as more desirable than identical cookies from a jar containing ten, and rated them higher still when they had seen the jar go from ten to two.
Worchel, Lee and Adewole, 1975
How to use it
State the constraint and the reason
"Four places left, because I only take eight clients a quarter" is credible. A red badge is not.
Use real deadlines
An early-bird rate that ends on a date and actually ends is scarcity. One that rolls over is a lie people remember.
Show demand honestly
"Last booked two hours ago" works when it is live data. Fake it once and every future claim is discounted.
Related
Sources that shaped this entry: Digital Psychology, growth.design.