Before revision:  We introduce a general dose-response curve and argue that the left and right-boundedness or saturation of the reponse in natural things leads to thin-tails, even when the "underlying" random variable at the source of the exposure is fat-tailed.
After revision:  We introduce a general dose-response curve and argue that the left and right-boundedness or saturation of the response in natural things leads to thin-tails, even when the "underlying" random variable at the source of the exposure is fat-tailed.