We are not rational; we are rationalizers.
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Homo economicus and the rationalizing mind
We are not rational; we are rationalizers. The line challenges a model that dominated economics for a long time. Homo economicus is the imaginary person who always calculates costs and benefits perfectly. Real people, however, rarely behave this way. Instead, we often decide first and justify later.
Behavioural economics grew from this gap. Daniel Kahneman and Amos Tversky showed that people rely on mental shortcuts. These heuristics are fast and often useful. Yet they also create predictable errors. For example, we fear losses more than we value equal gains, a pattern called loss aversion.
Living with the myth of homo economicus
Rationalization is the story we tell after the fact. We buy an expensive gadget on impulse, then explain that it will save time. We stay in a bad project because we already invested so much. In both cases, the explanation feels logical. However, the decision came from emotion or habit.
Knowing this does not make us immune. Still, it helps to slow down for important choices. Ask what you would decide if you were advising a friend. Moreover, write down your reasons before deciding, not afterwards. That simple step reduces the space for convenient stories.
Companies use this knowledge too. Default options, framing and social proof all influence behaviour. Therefore, understanding our biases also protects us as consumers, because we recognise when someone is nudging us.
In the end, accepting that we are not perfectly rational is freeing. It invites humility, curiosity and better systems. We stop expecting ourselves to behave like a calculator, and start designing choices that work for real humans.
In addition, emotions are not the enemy of good decisions. Neuroscientist Antonio Damasio found that patients with damage to emotional brain areas struggled to make even simple choices. Therefore, feelings provide essential signals. The goal is not to remove them, but rather to understand them and combine them with careful reasoning.
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Read more about homo economicus on Wikipedia.
