{"id":"study-comparative-advantage-show-math","audience":"college","category":"explaining","technique":"examples","track":"study","title":"Work out comparative advantage from a production table","free":false,"task":"Your Intro Economics problem set has a comparative advantage table you can't crack. Get exactly 3 numbered lines: each country's opportunity cost of one phone with the math shown, then which country should make phones and which shirts, plain text, under 75 words. Use the corrected numbers from the TA's post.","materialLabel":"The problem and TA post (attached to your prompt automatically)","material":"ECON 1010 - Problem Set 3, Question 4\n\nIn one day, each country can make EITHER shirts OR phones:\n\nCountry     | Shirts | Phones\nAvalon      | 10     | 5\nBrevia      | 6      | 4\n\nQuestion: Which country has the comparative advantage in phones? Show the opportunity cost of one phone in each country.\n\nTA POST (Canvas): \"Typo in Q4: Brevia can make 6 PHONES, not 4. So Brevia: 6 shirts or 6 phones.\"\n\nLecture notes:\n- Opportunity cost of 1 phone = shirts given up / phones made.\n- Comparative advantage = the LOWER opportunity cost.\n- Absolute advantage (who makes more of something) is NOT the same thing. \"Don't mix them up on the exam.\" - Prof. Ruiz\n\nMy confusion: Avalon makes more shirts AND... wait, does Avalon make more of everything?\nPS due Thursday.","rules":[{"type":"numberedItems","count":3},{"type":"maxWords","max":75},{"type":"plainText"}],"mistakes":[{"title":"Asking for a definition","why":"The AI defines comparative advantage in general and may skip your table.","fix":"Ask for the math: \"Show each country's opportunity cost of one phone.\"","checks":["r0","r1"]},{"title":"Missing the TA's fix","why":"The typo and the correction are both in your material.","fix":"Add: \"Use Brevia = 6 phones from the TA's post.\"","checks":["r1"]},{"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 3 numbered lines.\"","checks":["numberedItems"]},{"title":"Mixing up the two advantages","why":"The AI may point to who makes more, which is absolute advantage.","fix":"Add: \"Decide by the lower opportunity cost.\"","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 line: \"each under 20 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":"Asks to show the math","patterns":["show.{0,15}(math|work)","opportunity cost","\\d+ ?/ ?\\d+"]},{"label":"Uses the correction","patterns":["6 phones","correct","TA"]},{"label":"Says how many lines","patterns":["\\b(3|three)\\b.{0,25}line"]},{"label":"Uses the right rule","patterns":["lower","comparative"]},{"label":"Sets a length limit","patterns":["\\d+\\s*words","word (limit|count)","under \\d+"]}],"hint":"Comparative advantage comes down to two divisions. Ask for each country's opportunity cost with the math, the corrected numbers, and the decision based on the lower cost.","rubricLabels":["Line 1 shows Avalon's opportunity cost of one phone: 10 / 5 = 2 shirts","Line 2 shows Brevia's opportunity cost of one phone with the corrected numbers: 6 / 6 = 1 shirt (not 6 / 4)","Line 3 says Brevia should make phones (lower opportunity cost) and Avalon shirts, without confusing comparative and absolute advantage, and there is no general definition or other text beyond the 3 lines"]}