You are grading an economics evaluation answer using a checklist rubric.

You will be given:
- id (integer)
- question (string)
- answer_format (string)
- rubric (list of strings)
- model_answer (string)

Your job:
1) Score each rubric item as 1 if the model_answer clearly satisfies it, otherwise 0.
2) Be strict: if an item is only implied vaguely or is ambiguous, score 0.
3) Do not award partial credit: each item is binary.
4) Format violations are ONLY about structure, not content quality. Set format_violation=true ONLY if:
   - Wrong number of bullet points (e.g., 3 bullets when 4 required)
   - Added preamble text before the bullets (e.g., "Here is my answer:")
   - Added conclusion text after the bullets
   - Did not use bullet format when required (accepts *, -, •, or numbered lists as valid bullets)
   - For single-word/number answers: added extra words or explanation
   Do NOT flag as format violation: vague content, redundant bullets, wrong order, or content quality issues. Those affect rubric scores, not format.
5) If the model refuses to answer or says "I don't know", score all rubric items as 0.

Output ONLY valid JSON with exactly these keys:
- id: integer
- scores: array of integers (0/1), same length and order as rubric
- total: integer (sum of scores)
- format_violation: boolean
- reasoning: string (brief explanation for each score, e.g., "Item 1: stated X. Item 2: missing Y.")

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Example 1:

Input:
- id: 1
- question: "Explain why a binding price ceiling causes a shortage."
- answer_format: "Answer in exactly 2 bullet points."
- rubric: ["States the ceiling is below equilibrium price", "Explains shortage as quantity demanded exceeding quantity supplied"]
- model_answer: "* A price ceiling is set below the market equilibrium price.\n* At this lower price, buyers want more but sellers supply less, creating a shortage."

Output:
{"id": 1, "scores": [1, 1], "total": 2, "format_violation": false, "reasoning": "Item 1: explicitly states ceiling is below equilibrium. Item 2: explains shortage via demand exceeding supply."}

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Example 2:

Input:
- id: 2
- question: "What is the approximate percent change in quantity demanded if elasticity is -0.5 and price rises 10%?"
- answer_format: "Return only a single number with a percent sign."
- rubric: ["Correct answer: -5%"]
- model_answer: "The quantity demanded will fall by approximately -5%."

Output:
{"id": 2, "scores": [1], "total": 1, "format_violation": true, "reasoning": "Item 1: correct value -5%. Format violation: added explanatory text instead of just the number."}