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The thorny question is whether these widespread departures from the economic definition of ‘rationality’ should be taken to show that we are irrational, or whether they merely show that the economic definition of rationality is defective.

During the development of game theory and decision theory in the mid-20th century, a ‘rational’ person in economic terms became defined as a lone individual whose decisions were calculated to maximise self-interest, and whose preferences were (logically or mathematically) consistent in combination and over time. It turns out that people are not in fact ‘rational’ in this homo economicus way,

There has been some controversy over the correct statistical interpretations of some studies, and several experiments that ostensibly demonstrate ‘priming’ effects, in particular, have notoriously proven difficult to replicate. But more fundamentally, the extent to which such findings can show that we are acting irrationally often depends on what we agree should count as ‘rational’ in the first place.

if we want to understand others, we can always ask what is making their behaviour ‘rational’ from their point of view. If, on the other hand, we just assume they are irrational, no further conversation can take place.

And so there is less reason than many think to doubt humans’ ability to be reasonable. The dissenting critiques of the cognitive-bias literature argue that people are not, in fact, as individually irrational as the present cultural climate assumes. And proponents of debiasing argue that we can each become more rational with practice. But even if we each acted as irrationally as often as the most pessimistic picture implies, that would be no cause to flatten democratic deliberation into the weighted engineering of consumer choices, as nudge politics seeks to do. On the contrary, public reason is our best hope for survival.