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ecta-theory-model

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Use when the central theorem of an Econometrica manuscript must be stated cleanly and proven completely — assumptions, generality, and proof strategy. Builds and audits the theorem-and-proof core; it does not derive the identification/asymptotic conditions (use ecta-identification) or run simulations (use ecta-robustness).

Econometrica-Skills/skills/ecta-theory-model/SKILL.md

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Sep 27, 2026
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MIT

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# Theorem and Proof Strategy (ecta-theory-model)

## When to trigger

- The central result is stated informally or its conditions are scattered through the text
- The proof has gaps: "it is easy to see," "by a standard argument," or a missing step
- Regularity conditions are invoked mid-proof but never stated as assumptions
- You are unsure whether the result is as general as claimed, or whether the proof secretly uses more

This is the heart of an Econometrica paper. The product is a **complete, correct proof** of a
**general, cleanly stated** theorem. Econometrica is the field's theorem-proof journal: the
referee pool (routed by the handling co-editor) reads proofs line by line, and a single
genuine gap can sink an otherwise strong paper — this is the most common rejection cause
here, in contrast to applied siblings (AER / QJE / JPE / REStud) where a credible empirical
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