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Lavender oil-pastel comic shows the same student planning on Monday to study before a movie, then reaching for the movie remote on Saturday, illustrating a preference reversal when effort becomes immediate.

Present Bias: Why Plans Change When the Moment Arrives

Understand present bias through preference reversals and study examples. Compare commitment devices, reminders and defaults without ignoring changing needs.

Red and black scratchboard comic of a crab magician framing six dollars per month as seventy-two dollars over twelve months, while a snail asks whether payment dates, fees and cancellation terms are the same.

Attention and Framing: How Presentation Affects Choices

Explore attention and framing with equivalent-price examples. Distinguish changed information, bounded rationality, reference points and loss aversion.

Kraft-paper charcoal comic of a porcupine carpenter offering a repair guarantee as a signal while a raccoon buyer asks to inspect the table joints as a screen, distinguishing who initiates each action.

Signaling vs. Screening: How They Build Trust Differently

Jade and amber brush-ink comic of a helmeted gecko beside a bicycle, considering an extra lock after receiving insurance, illustrating how coverage can change the private payoff to precautions.

Moral Hazard: How Agreements Change Hidden Behavior

Blue ballpoint and raspberry comic of a fox offering two hundred dollars for look-alike used washing machines; one seller leaves while another accepts, illustrating how hidden quality changes market participation.

Adverse Selection: Hidden Quality and Market Participation

Peach and turquoise sidewalk-chalk comic of pigeons searching by car around three occupied parking spaces after the meter becomes free, illustrating a possible second-round response and search-time cost.

Economic Feedback: Follow the Response After the First

Lavender-pencil comic of shoppers asking whether a bag fee reduces bag use and whether it is fair, distinguishing positive analysis of effects from normative evaluation using values.

Positive vs. Normative Economics: Facts and Value Judgments

Hand-tinted etching comic of a traveler using a subway map with four station connections while a puzzled nearby tree asks why it is omitted, illustrating purposeful simplification in economic models.

Economic Models: Assumptions, Ceteris Paribus and Limits

Hand-drawn blue commuter discovers an empty bag beside a café offering 40 cents off with a reusable cup, illustrating how constraints limit responses to incentives.

Economic Incentives: Choices, Constraints and Evidence

Red crayon comic of a courier comparing 14 dollars in extra pay with 3 dollars of fuel and 9 dollars of time, leaving 2 dollars of net benefit in the article’s marginal-thinking example.

Marginal Analysis: Compare Extra Benefits and Costs

Mint and plum linocut comic of an otter with a free concert ticket choosing between a concert and an extra café shift, illustrating scarce time and opportunity cost.

Opportunity Cost: Find the Best Alternative Forgone

SAT MATH — original handwritten comic illustration.

SAT Math Score Plateau: Diagnose Errors and Improve Practice

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