“The psychological impact of an outcome depends on the expectation that precedes it. This is why the same outcome will be experienced differently depending on the reference point you have in mind. Disappointment is regret related to a decision you could have made differently.”
—
Daniel Kahneman
Thinking, Fast and Slow (2011); also Kahneman & Tversky's research on reference points and regret
Commentary
Regret and disappointment are not simply negative emotions; they shape decision-making. We avoid decisions that will produce regret even if objectively they are optimal. This explains 'psychological inertia': staying in bad situations because changing would create regret ('I was happy before I changed').
Kahneman's research showed that people making the same choice (e.g., not checking a rare flight) feel differently based on whether an alternative existed and was salient. If you didn't know an alternative existed, no regret. If you knew but didn't take it, intense regret. Rational choice theory ignores this emotional dimension; Kahneman centers it.
Commentary
Regret and disappointment are not simply negative emotions; they shape decision-making. We avoid decisions that will produce regret even if objectively they are optimal. This explains 'psychological inertia': staying in bad situations because changing would create regret ('I was happy before I changed').
Kahneman's research showed that people making the same choice (e.g., not checking a rare flight) feel differently based on whether an alternative existed and was salient. If you didn't know an alternative existed, no regret. If you knew but didn't take it, intense regret. Rational choice theory ignores this emotional dimension; Kahneman centers it.