{"id":"study-market-structures-compare","audience":"college","category":"studying","technique":"format","track":"study","title":"Compare perfect competition and monopoly side by side","free":false,"task":"Your Microeconomics exam asks you to contrast market structures. Get exactly 4 numbered lines covering number of sellers, price control, barriers to entry and long-run profit, each in the form 'Feature: Perfect competition | Monopoly', each under 22 words, plain text. Use only your lecture notes, including the professor's correction about long-run profit.","materialLabel":"Your lecture notes (attached to your prompt automatically)","material":"ECON 2010 - Microeconomics - Lecture 16: Market structures (Prof. Brandt)\n\nPERFECT COMPETITION\n- Sellers: many small firms, identical products\n- Price control: none; firms are price takers\n- Barriers to entry: none; firms can enter and exit freely\n- Long-run profit: I wrote \"firms earn big economic profits in the long run.\"\n   ** Prof. B: \"No. Free entry means new firms come in until economic profit is ZERO in the long run.\" **\n- Example: wheat farmers\n\nMONOPOLY\n- Sellers: one firm, no close substitutes\n- Price control: price maker (sets price, faces the whole demand curve)\n- Barriers to entry: high (patents, control of a resource, huge startup costs)\n- Long-run profit: can keep economic profits because others can't enter\n- Example: a town's only water utility\n\nNot on this exam: oligopoly, monopolistic competition (Lecture 17).\nExam Nov 24.","rules":[{"type":"numberedItems","count":4},{"type":"maxWords","max":110},{"type":"plainText"}],"mistakes":[{"title":"Asking to compare","why":"The AI writes an essay or a table with extra rows.","fix":"Show the shape: \"Feature: Perfect competition | Monopoly\".","checks":["r0"]},{"title":"Not saying how many lines","why":"The AI picks its own number, and it usually picks more lines than you need.","fix":"Be exact: \"Exactly 4 numbered lines.\"","checks":["numberedItems"]},{"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 side: \"each side under 9 words.\"","checks":["maxWords"]},{"title":"Missing the correction","why":"Your wrong note about long-run profit is still in the material.","fix":"Add: \"Perfect competition has zero long-run profit, per Prof. Brandt.\"","checks":["r1"]},{"title":"Adding other structures","why":"The AI may add oligopoly for context.","fix":"Add: \"Only these two.\"","checks":["r2","plainText"]}],"promptHints":[{"label":"Says how many lines","patterns":["\\b(4|four)\\b.{0,25}line"]},{"label":"Shows the line shape","patterns":["\\|","competition.{0,10}monopoly","like ['\"]","format"]},{"label":"Uses the correction","patterns":["zero","long.run","correct"]},{"label":"Sets a length limit","patterns":["\\d+\\s*words","word (limit|count)","under \\d+"]},{"label":"Says to use only the material","patterns":["only.{0,30}(notes|material|source|excerpt|text|reading|passage|draft|facts|article|handout|sheet|guide|chapter|data|list)","no outside","don't add","do not add","don't invent","lecture"]}],"hint":"Show the AI the side-by-side line, name the four features, and point it to the long-run profit correction.","rubricLabels":["Has 4 lines covering sellers, price control, barriers to entry and long-run profit, each in the form 'Feature: Perfect competition | Monopoly'","The long-run profit line says perfect competition has zero economic profit in the long run (the correction) and monopoly can keep profits","Uses only the notes, with no oligopoly or monopolistic competition and no extra explanation"]}