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?

1. 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.

1. Why it matters. Which prior result it weakens an assumption of, generalizes, or overturns — the

delta from jet-literature-positioning.

1. *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.

1. 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:

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