Costly Signaling, explained.
Costly signaling can convey otherwise hidden information when the cost or benefit of sending a signal differs across types.
Why it happens
The stipulated wage is 80 after qualifying and 40 otherwise. Education costs one unit per threshold unit for one type and three for the other. Each type qualifies if its net wage is at least 40; ties qualify. Thresholds above 13⅓ separate these types within the slider range.
Costly signaling can convey otherwise hidden information when the cost or benefit of sending a signal differs across types.
Read the result
Compare each net qualified wage with forty. Separation occurs because the same threshold creates different incentives, not because the label itself proves productivity.
A worked example
A credential with unequal costs
Set the threshold to ten. Both types qualify because eighty minus their education costs is at least forty.
Raise it to fifteen. The lower-cost type keeps sixty-five; the higher-cost type would keep thirty-five and chooses the outside wage.
The credential separates types under the stipulated wage rule. This calculation does not establish how employers would set wages in equilibrium.
OPTIONAL DEEPER DETAILGo deeper: inside the model
Inside this model
The stipulated wage is 80 after qualifying and 40 otherwise. Education costs one unit per threshold unit for one type and three for the other. Each type qualifies if its net wage is at least 40; ties qualify. Thresholds above 13⅓ separate these types within the slider range.
Where this idea is useful
A practical use
Credentials can communicate information even when the activity is modelled as not directly increasing productivity.
A common misconception
“A costly signal must be socially productive.”
An activity can convey information without adding productivity in the model. Whether real education develops skills is a separate empirical question.
What this explanation leaves out
- This is a payoff comparison under a fixed wage rule, not a full signaling equilibrium with endogenous employer beliefs. Assumed education costs do not measure ability, social worth or actual labour-market returns.
Why does a zero threshold not separate types?
With no qualifying cost, both types can obtain the high wage under this rule. There is no differential incentive supporting separation.
Does your proposed signal cost different types differently, or is it simply expensive for everyone?
Associated thinkers
Associations marked provisional are awaiting source review.
Further reading
Explore the original research or the teaching reference behind this experiment.