In the 18th century, Daniel Bernoulli transformed the mysticism of earlier logic into a logical argument for rational decision-makers by emphasizing the relationship between objective measurement and subjective utility. This era marked a profound intellectual pivot: the world was no longer a theater of divine whims or inescapable fatalism, but a landscape that could be navigated through human agency and mathematical rigor.

The Rationality of the "Gut"

Contrary to the belief that emotion is a defect in logic, Bernoulli argued that blending measurement and subjective beliefs in decision making was an "impressive achievement" of logic. He posited that individuals do not assess wealth in absolute numbers, but through the lens of their own circumstances—their utility. This synthesis allows us to predict the impact of human rationality on economic hypotheses with far greater accuracy than simple arithmetic ever could.

His description of how human beings employ both measurement and gut in making decisions when outcomes are uncertain was a revolutionary step, effectively transforming "acts of God" into manageable degrees of belief.