{"id":"study-externality-campus-example-check","audience":"college","category":"explaining","technique":"grounding","track":"study","title":"Get a negative externality explained with a campus example","free":false,"task":"Your Environmental Economics midterm asks you to explain a negative externality with an example. Get exactly 3 numbered sentences using only the stadium parking example from lecture (who decides, who else pays, why the market price is too low), then one line starting 'Check:' with a question to test yourself, under 75 words, plain text. Use the corrected cost figure, and no graphs or formulas.","materialLabel":"Your lecture notes (attached to your prompt automatically)","material":"ENVS 2200 - Environmental Economics - Lecture 5 (Prof. Haddad)\n\nEXTERNALITY: a cost or benefit that falls on people who aren't part of the decision.\nNEGATIVE externality: the cost lands on third parties, so the market price is too low and people do too much of the activity.\n\nLECTURE EXAMPLE: game-day stadium parking\n- Fans decide to drive to the stadium and pay $15 to park.\n- Traffic jams and exhaust hit people who live near the stadium, who didn't choose any of it.\n- Prof's estimate: each car causes about $12 in costs to neighbors (time stuck in traffic, noise, air pollution).\n   ** Prof. Haddad email: \"Typo on slide 8: the cost per car is $8, not $12.\" **\n- So the \"true\" cost per car is $15 + $8, but fans only pay $15.\n\nFix ideas (next lecture, not on midterm): congestion fees, Pigouvian tax.\n\nMidterm short answer: \"Explain a negative externality using an example. No graphs needed.\"\nOffice hours canceled Friday.","rules":[{"type":"numberedItems","count":3},{"type":"maxWords","max":75},{"type":"plainText"}],"mistakes":[{"title":"Asking for a definition","why":"The AI gives a textbook definition with factory pollution, not your lecture's example.","fix":"Say: \"Use only the stadium parking example from lecture.\"","checks":["r0"]},{"title":"Not saying how many sentences","why":"The AI picks its own number, and it usually picks more sentences than you need.","fix":"Be exact: \"Exactly 3 numbered sentences.\"","checks":["numberedItems"]},{"title":"Missing the correction","why":"The slide's typo and the email's fix are both in your notes.","fix":"Add: \"Use $8 per car from the email.\"","checks":["r1"]},{"title":"No way to test yourself","why":"The AI explains and stops, so you never check whether it stuck.","fix":"Add: \"End with one line starting 'Check:' with a question, no answer.\"","checks":["r2"]},{"title":"Trusting the AI to count words","why":"AI is bad at counting. Ask for a total and it often lands 20% over.","fix":"Cap each sentence: \"each under 18 words.\"","checks":["maxWords"]},{"title":"Forgetting where it will be read","why":"AI formats for a screen, with bold and headings that show up as stray symbols in your notes.","fix":"Say: \"Plain text, no bold, no headings.\"","checks":["plainText"]}],"promptHints":[{"label":"Names the example","patterns":["stadium","parking"]},{"label":"Says how many sentences","patterns":["\\b(3|three)\\b.{0,25}sentence"]},{"label":"Uses the correction","patterns":["\\$8","correct","email","typo"]},{"label":"Asks for a check question","patterns":["check:","check question","test (me|myself)","quiz me"]},{"label":"Sets a length limit","patterns":["\\d+\\s*words","word (limit|count)","under \\d+"]}],"hint":"Point the AI to your lecture's example, give it the three parts to cover, use the corrected number, and ask for a question to test yourself.","rubricLabels":["Uses only the stadium parking example to cover who decides (fans driving), who else pays (neighbors), and why the price is too low (fans pay $15 but not the cost to neighbors)","If a per-car cost to neighbors is given, it is $8 (the correction, not $12), and there are no graphs, formulas, congestion fees or Pigouvian taxes","Ends with one line starting 'Check:' that asks a question about externalities, and does not answer it"]}