Signaling
What is Signaling?
Signaling is when an informed party credibly reveals private information to a less-informed party to overcome asymmetric information.
A classic example is education as a signal of ability to employers, or a warranty signaling product quality. Effective signals are costly enough that low-quality types won't fake them.
Signaling: a worked example
An employer values a high ability worker at $80,000 a year and a low ability worker at $50,000, but cannot tell them apart. With an even mix the employer offers the average, $65,000, which underpays the high type. Now introduce a degree that raises nobody's productivity. Earning it costs a high ability worker $10,000 in effort and time, and costs a low ability worker $36,000, since the coursework comes harder. The employer pays $80,000 to degree holders and $50,000 to everyone else. A high ability worker nets 80,000 minus 10,000, or $70,000, against $50,000 without the degree, so she enrolls. A low ability worker would net 80,000 minus 36,000, or $44,000, against $50,000 without it, so he stays out. The degree separates the two types purely because the wage gap of $30,000 sits above one type's cost and below the other's.
The mistake students make with signaling
The model gets read as proof that a degree teaches nothing. Zero productivity gain is an assumption written in to isolate the information effect, not a finding the model produces. A credential can build real skill and reveal ability at the same time, and splitting the wage premium between those two channels is an empirical question the model does not settle. The exam safe way to put it is conditional: if the degree adds no productivity, then the wage gap it earns must be paying for the information it carries about the worker who chose to get it.
Signaling questions
What is the difference between signaling and screening?
Signaling has the informed party act first to reveal what it knows, such as a job candidate earning a credential or a seller offering a long warranty. Screening has the uninformed party act first to draw the information out, such as an insurer offering a menu of policies with different deductibles so that low risk buyers select the high deductible option. Same information problem, opposite mover.
Why does a signal have to be costly?
Cost is what makes a signal believable. If sending it were free, every type would send it, the message would carry no information, and receivers would ignore it. What matters is that the cost differs by type, so the sender with genuinely high quality finds it cheap enough to be worth the reward while an imitator finds it more expensive than the reward. That gap is what lets a signal separate the types.
What are examples of signaling in economics?
College degrees signal ability to employers, product warranties signal that a manufacturer expects few failures, dividend payments signal that a company expects steady earnings, and heavy visible advertising signals that a firm expects repeat customers. In each case the sender knows something the receiver does not and pays a cost that would be too steep for a low quality sender to copy convincingly.
Related terms
Common comparisons
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