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name: jet-contribution-framing description: Use when framing the contribution of a Journal of Economic Theory (JET) paper so its theoretical advance is unmistakable — lead with the theorem, state why the result matters for the relevant theory, and right-size the claim to exactly what the proof delivers. For JET's theory-first bar; it does not overclaim.

Contribution Framing (jet-contribution-framing)

When to trigger

• Writing the abstract and introduction of a JET theory paper
• A desk editor must see the theoretical contribution within the first page
• You need to make sure the claim does not exceed the proof

What JET rewards

JET accepts a paper because it is a rigorous, original theoretical contribution. Framing must put the theorem first and make its significance legible to the matching editor and two expert referees. A JET introduction is not a story arc around data — it is a precise statement of what is now known that was not before.

The framing template

1. The question, theoretically posed. What property of mechanisms / equilibria / preferences / markets is at stake?
2. The result, stated as a theorem. One sentence the abstract can carry: "We characterize / prove that / show existence of ...". Because abstract references must be written in full, cite at most one or two anchor results there.
3. Why it matters. Which prior result it weakens an assumption of, generalizes, or overturns — the delta from jet-literature-positioning.
4. What it does not claim. Name the scope (finite types, specific domain) so referees do not read in a stronger claim than the proof supports.
5. Subfield signal. State the area (mechanism design, decision theory, matching, …) so routing reaches the right editor.

Right-sizing the claim

• Distinguish characterization vs. existence vs. comparative statics — claim only the one(s) you proved.
• Avoid "general" / "robust" / "essentially" unless the theorem literally says so.
• If a result holds only under an extra condition, say it in the abstract, not a footnote.

Referee-proof contribution sentence

Before finalizing, rewrite the main contribution in this syntax:

Under [assumptions], we prove [result type] for [environment], which [weakens/generalizes/constructs]
[closest theorem] by [precise delta].

Every bracket should map to a theorem statement or a cited frontier result. If a bracket is rhetorical rather than formal, the framing is ahead of the proof.

Result-type framing matrix

Different JET result types demand different lead verbs and carry different overclaiming risks:

Result type	Lead verb in abstract	What the intro must promise	Typical framing risk
Characterization	"We characterize ..."	the full set of mechanisms/preferences/equilibria satisfying the property	writing "if and only if" when only sufficiency is proved
Existence	"We prove existence of ..."	the conditions plus the route (fixed point, constructive, lattice)	implying uniqueness or computability the proof never delivers
Uniqueness / comparative statics	"We show the equilibrium is unique / monotone in ..."	the order structure doing the work	asserting comparative statics outside the proved parameter region
Impossibility	"No mechanism satisfying A1–A3 can ..."	the exact axiom set, with tightness examples per axiom	letting readers infer a stronger informal reading than the axioms support
Counterexample paper	"We construct an example showing ..."	why the example overturns a folk presumption	underselling — a decisive counterexample is a JET contribution in its own right

Worked vignette: framing a mechanism-design result

Hypothetical paper: with two maxmin bidders holding a finite set of priors, the revenue-maximizing auction is a posted price. The framing pass:

• Question, theoretically posed: how does bidder ambiguity reshape optimal selling?
• Theorem sentence: "Under Assumptions 1–3 (maxmin bidders, finite prior set, independent values), we characterize the seller-optimal mechanism and show it is a posted price."
• Why it matters: it overturns the exclusion-at-the-margin logic of the Bayesian optimal auction once the common-prior assumption is dropped.
• Scope guardrail: two bidders, finite prior sets; does NOT claim the result for smooth-ambiguity preferences — say so in the abstract.
• Subfield signal: mechanism design and decision theory under ambiguity — name both, since JET routes by editor field.

Calibration: how accepted JET introductions tend to run

• Introductions commonly run a few pages: the motivating economic question opens, an informal statement of the main theorem appears early, then positioning and a roadmap. Patterns vary by subfield — calibrate against recent JET issues in your area, and confirm against the journal's current author guidelines for any formal length rules.
• The abstract stays formal and short; the introduction carries the intuition.

Anti-patterns

• An empirical-style narrative intro that buries the theorem
• Overclaiming generality the proof does not reach
• An abstract with a sweeping claim and a much narrower theorem in §3
• Selling motivation while leaving the actual statement vague

Output format

【One-line theorem】<abstract sentence>
【Why it matters】weakens/generalizes/overturns <closest result>
【Scope guardrail】holds under <conditions>; does NOT claim <X>
【Subfield】<routing area>
【Next】jet-writing-style (polish) / jet-submission