Compare the world's best ideas

Similar ideas are easy to confuse. These side-by-side comparisons make the difference clear — what each means, when each matters, and which is which.

The sunk cost fallacy vs Opportunity costThe sunk-cost fallacy looks backward at money already spent; opportunity cost …→ Loss aversion vs The sunk cost fallacyBoth make us cling to bad bets, but loss aversion is the feeling (losses hurt …→ Deliberate practice vs Deep work is rareBoth demand intense focus, but deliberate practice is how you build a skill (u…→ Growth mindset vs Grit beats talentGrowth mindset is a belief (ability grows with effort); grit is a behaviour (p…→ Flow state vs Deep work is rareDeep work is the discipline of focusing without distraction; flow is the exper…→ The Dunning-Kruger effect vs The overconfidence effectBoth are about being too sure of yourself. The overconfidence effect is the ge…→ Confirmation bias vs The availability heuristicBoth distort how we judge reality, but confirmation bias filters for what we a…→ The anchoring effect vs The framing effectBoth let presentation steer your judgment, but anchoring works through a numbe…→ The spacing effect vs Deliberate practiceBoth are about learning better, but the spacing effect is about WHEN you pract…→ Negativity bias vs Loss aversionClose cousins: negativity bias is that bad outweighs good in general (one insu…→ Base rate neglect vs The availability heuristicBoth make you misjudge how likely something is, but base-rate neglect ignores …→ The endowment effect vs The IKEA effectBoth inflate how much you value something, but the endowment effect is trigger…→ Hanlon's razor vs The fundamental attribution errorBoth are about how we explain other people's bad behaviour. The fundamental at…→ First-principles thinking vs Second order thinkingBoth are ways to think more clearly than the crowd, but first-principles think…→ Moral licensing vs Cognitive dissonanceBoth are about squaring our actions with our self-image, but moral licensing l…→ The planning fallacy vs Hofstadter's lawClosely related: the planning fallacy is the bias itself — you underestimate h…→ Via negativa vs Less but betterBoth favour subtraction over addition, but via negativa improves a system by r…→ Black swans vs The Lindy effectBoth come from thinking about an uncertain future, but a black swan is the rar…→