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Overcoming Bias Commenter's avatar

In principle, I agree with you. But imagine a signal which approximates the ideal you describe. For example, consider my ATM card and PIN number. They are very cheap for me to obtain and remember; they demonstrate to the bank that I have a certain attribute (authority to withdraw money from my account); and they would be expensive for an imposter to obtain). A nearly ideal signal, and yet if someone saw me withdrawing money from my bank account , would they see it as a signal?

I'm not sure, but I think the problem is my sloppy thinking (and perhaps that of others) about what a signal is.

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Joe's avatar

I don't think it's true that signalling is expensive by definition. A signal just needs to be differentially expensive according to whether the individual does or doesn't have the claimed attribute. The optimal signal is infinitely expensive (i.e. impossible) for those who don't have the attribute, and infinitely cheap (i.e. free) for those who do.

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