"In general the conditions upon which discrimination, when possible, can usefully be exercised seem to be (i) that the acceptance of one mate precludes the effective acceptance of alternative mates, and (ii) that the rejection of an offer will be followed by other offers, either certainly, or with such high probability, that the risk of their non-occurrence shall be smaller than the probable advantage to be gained by the choice of a mate."
Ronald A. Fisher
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