Writing Style (jfm-writing-style)

When to trigger

• The mechanism, design, and exhibits are stable and it is time to write the intro and abstract (not before)
• The abstract describes data and methods but never states the microstructure result
• The intro reads like a broad-finance paper and does not signal "this is microstructure" in the first paragraph
• Institutional detail (market rules, order types, venue mechanics) is vague where precision is the JFM currency
• A coauthor's draft over-claims generality JFM referees will not grant

The JFM voice

JFM prose is precise about market mechanics and disciplined about claims. The reader is a microstructure specialist who wants the institutional detail right and the mechanism stated plainly. Three habits define the house style:

1. Lead with the trading-process mechanism, fast. The first paragraph should name the market object (spread, depth, order flow, price discovery) and the economic force. A JFM intro that buries the mechanism behind two paragraphs of general-finance throat-clearing reads as mis-targeted.
2. Get the institutions exactly right. Name the venue, the matching/priority rule, the order types, the tick size, the relevant regulation. Microstructure referees notice when "the exchange" is used where the actual mechanism matters. This precision is the contribution's credibility.
3. Claim only what the design supports. Prefer "spreads narrow by X bps for treated stocks" to "liquidity improves." State economic magnitude in market terms (bps, depth, impact), not just statistical significance.

Writing the intro and abstract

Abstract: in ~4-6 sentences — (1) the market question, (2) the data/setting in microstructure terms, (3) the identifying variation, (4) the result with a magnitude in market units, (5) the mechanism it implies, (6) one sentence of contribution. Confirm the exact abstract word limit on the guide for authors (检索于 2026-06；以官网为准 — 待核实).

Intro (the funnel): (1) the market phenomenon and why how-it-trades matters; (2) what we do and find, in one tight paragraph with the headline magnitude; (3) the identifying variation / measurement advance; (4) placement vs. the microstructure lineage (one paragraph, not a survey); (5) why JFM and not a broad-finance frame — the specialist depth. Keep the contribution sentence verbatim-consistent with the abstract and the title.

Throughout: define each liquidity measure on first use; keep units consistent with the exhibits; resist the passive "it is found that."

Before / after (illustrative)

Before (broad-finance framing): "We examine the relationship between trading activity and asset prices using a large dataset of intraday transactions and find economically and statistically significant effects." This could be any finance paper; it states no mechanism and no magnitude.

After (JFM voice): "When a stock joins the pilot's wider-tick group, effective spreads widen by 12 bps and quoted depth at the touch nearly doubles, while the permanent (adverse-selection) component is unchanged — implying the wider tick raises liquidity-supply rents without altering information asymmetry." It names the shock, the market objects, the magnitudes in market units, and the mechanism it identifies. That is the sentence a microstructure editor wants in paragraph one.

The mechanism sentence

Every JFM paper should have one sentence a reader could quote as "what this paper shows about how markets work." It names the cause, the market object, the magnitude, and the channel: "A wider tick raises liquidity-supplier rents — depth doubles while the adverse-selection component is flat — so the cost falls on uninformed traders." Draft this sentence early and let it discipline the whole paper; if you cannot write it cleanly, the contribution is not yet sharp. It should appear (in some form) in the abstract, the intro, and the conclusion, keeping the paper anchored to a single mechanism rather than a list of correlations.

House-style details that signal fluency

• Use the field's terms precisely: effective vs. quoted spread, permanent vs. temporary impact, adverse selection vs. inventory cost, lit vs. dark, maker-taker. Loose usage reads as an outsider.
• Report magnitudes in the unit a trader thinks in (bps, cents, shares, microseconds), and benchmark against the average (a 2-bps effect on a 5-bps spread is large; on a 200-bps spread it is noise).
• Name dates and rules ("after Reg NMS, effective October 2007") rather than vague time references.
• Keep the active voice and a single, consistent label for each measure throughout.

Pruning the broad-finance throat-clearing

A common drag on microstructure intros is two opening paragraphs of general motivation ("financial markets are central to the economy…") before the specific question appears. A microstructure editor wants the trading-process question and the headline in the first half-page. Cut generic scene-setting to one or two sentences and move quickly to the market mechanism, the setting, and what you find. The same discipline applies to the literature review: place the paper in its sub-field in a tight paragraph rather than surveying. Density and specificity read as expertise; broad preamble reads as a paper hedging about whether it really belongs at JFM.

Checklist

• First paragraph names the trading-process object and the economic force
• Abstract states the result with a magnitude in market units, not just significance
• Institutional detail (venue, rules, order types, tick size, regulation) is exact, not generic
• Claims are sized in bps/depth/impact and bounded by the design
• The microstructure lineage is placed in the intro without a full literature survey
• One sentence says why JFM, not a broad-finance journal
• Contribution sentence is consistent across title, abstract, and intro

Calibrating claims to a skeptical specialist

Microstructure referees are unusually quick to flag over-claiming because they know how many ways a liquidity result can be an artifact. Match the verb to the evidence: a clean randomized shock supports "causes"; a panel regression supports "is associated with"; a heterogeneity pattern supports "consistent with [mechanism]," not "proves." Name the channel only when the design isolates it — "spreads narrow because adverse selection falls" requires showing the adverse-selection component moved, not just the total spread. State scope honestly: a result on large-cap U.S. equities is not a claim about all markets. This disciplined register reads as competence to a specialist, whereas sweeping language reads as naivety and invites a harsher review.

Anti-patterns

• An abstract that lists data and methods but never states the microstructure finding
• Generic institutional descriptions ("trades happen on the exchange") where the mechanism matters
• Over-claiming "liquidity improves" without magnitude or sign of the channel
• A broad-finance intro framing that hides the microstructure cut
• Significance-driven prose ("highly significant") instead of economic magnitude
• Polishing prose before the mechanism, measurement, and identification are settled

Sequencing the write so the mechanism survives editing

Write in the order that protects the contribution. First lock the results section prose around the stable exhibits, stating each magnitude in market units. Then write the mechanism / interpretation paragraphs that connect the numbers to the trading-process force, since that is what a microstructure editor evaluates. Only then write the intro, reverse-engineered from the results so the headline magnitude in paragraph two matches the tables exactly. Write the abstract last, distilled from the finished intro. This order prevents the common failure where a beautifully written intro promises a sharper or broader result than the exhibits deliver — a gap microstructure referees notice immediately and read as over-claiming.

Output format

【Journal】Journal of Financial Markets (JFM)
【Skill】jfm-writing-style
【Mechanism in para 1】trading-process object named early? [Y/N]
【Abstract】result + market-unit magnitude stated? [Y/N]
【Institutions】venue/rules/order-types/tick exact? [Y/N]
【Claim discipline】sized in bps/depth/impact, design-bounded? [Y/N]
【Why JFM line】present in intro? [Y/N]
【Source status】abstract limit / style verified or 待核实
【Next skill】jfm-submission