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Scratchy blue ink comic of puffin classmates joining a smartphone clubhouse, showing a direct network effect as their participation makes a study-group messaging app more useful.

Network effects can accelerate both growth and concentration

Distinguish direct and indirect network effects, then examine the switching and compatibility conditions that shape competition.

Hand-painted comic of an octopus dispatcher connecting a mouse restaurant, badger customer and turtle courier on linked seesaws, illustrating how platform fees and rules affect participation across groups.

Platforms coordinate interdependent groups

Understand platform pricing by following how participation on one side changes value for people on another side.

Sepia pen and blue watercolor comic of a beaver making clear keep and reschedule options on an appointment reminder while a woman freely chooses, illustrating choice architecture and personal agency.

Choice architecture should be judged by evidence and agency

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 creates conflict between today’s self and tomorrow’s self

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.

How limited attention and framing affect choices

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.

Signals and screens 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 changes behavior after an agreement

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 changes who enters the market

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.

Follow the response after the first response

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.

Separate description from judgment

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.

Use models as maps

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.

Trace incentives without assuming people are machines

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