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Opportunity Cost
The value of the best alternative you give up when you choose.
Related storiesConcepts
One library for now — short definitions you can return to after a story.
Glossary
Concept library
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Supply & Demand
Prices move when scarcity and desire push against each other.
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Inflation
When the same money buys less over time.
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Scarcity
Limited resources force trade-offs — real or manufactured.
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Consumer Surplus
The gap between what you'd pay and what you actually pay.
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Moral Hazard
Protected from downside, people take riskier actions.
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Adverse Selection
Hidden information tilts who joins a market — and why.
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Lemon Market
When buyers can't spot quality, bad products drive out good ones.
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Anchoring
The first number you see quietly sets the ruler for judgment.
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Loss Aversion
Losses sting more than equivalent gains please.
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Social Proof
Other people's choices become evidence for your own.
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FOMO
Fear of missing out turns urgency into a decision shortcut.
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Confirmation Bias
We notice evidence that agrees with what we already believe.
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Sunk Cost Fallacy
Past investment keeps us in choices that no longer make sense.
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Compound Interest
Returns earn returns — time becomes the multiplier.
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Diversification
Spreading risk so one failure doesn't define the outcome.
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Leverage
Borrowed capital amplifies gains — and losses.
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Dollar-Cost Averaging
Investing on a schedule to reduce timing risk.
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