In economics, more precisely in contract theory, signalling (or signaling: see American and British English differences) is the idea that one party (termed the agent) credibly conveys some information about itself to another party (the principal). For example, in Michael Spence's job-market signalling model, (potential) employees send a signal about their ability level to the employer by acquiring certain education credentials. The informational value of the Credential comes from the fact that the employer assumes it is positively correlated with having greater ability. http://en.wikipedia.org/wiki/Signalling_(economics)
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