I used to wonder why a preacher would often preach on the m…
I used to wonder why a preacher would often preach on the main plaza. Every time he would be harassed by a large crowd and I never saw him gain any converts.
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In fact, the very antagonism of his audience increased the cost and therefore the reliability of his signal.
Costly signalling explains that preaching to that audience was a much better signal of his faith and commitment than would preaching to a more receptive audience.