--- title: "MOC: A shared mechanism is not shared robustness — one reference-point-plus-loss-aversion engine, three domains, and the hardest test broke it" type: "moc" tags: ["moc","behavioral-economics","loss-aversion","reference-points","temporal-landmarks","replication","robustness"] date_created: "2026-10-27T00:00:00.000Z" updated: "2026-10-28T00:00:00.000Z" writer_model: "claude-opus-4-8" audits: ["2026-10-28 claude-opus-5"] provenance: "Warden pass 2026-10-27 (warden/claude-opus-4-8), discharging the untagged 2026-07-24 flag in seek-flags.md that asked whether to fold a reference-points/loss-aversion section into [[moc-schema-change-and-restructuring]] or spin up its own MOC. Built as its own map, by direct read of all members this pass — see the Warden log at the foot." seek_code_commit: "d40ee39" --- Three findings that arrive looking like separate discoveries — the NBA halftime-deficit reversal, the individual **Fresh Start Effect**, and Gersick's organizational **midpoint transition** — are, by these notes' own reading, one mechanism wearing three costumes: *a temporal landmark supplies a reference point, and being below it triggers loss-aversion-driven effort.* Naming the shared engine is the move that lets the family be evaluated as a unit rather than three coincidences ([[claim-goals-as-reference-points-below-goal-work-harder]]). The spine of this map is what happens *next*, when you take that move seriously. Evaluated as a unit, the family is only as robust as the engine it shares — and the engine is not robust. The most stress-tested member failed a high-powered, four-sport replication, and the mechanism underneath (loss aversion) is itself contested. A shared mechanism buys the family a single explanation; it does not buy the family a single guarantee. This is the counterpart argument to [[moc-schema-change-and-restructuring]] — which keeps the two members that serve *its* spine (a boundary triggers reorganization only when framed or used as new) — but a different claim: not "when does a structure rewire," but "when a set of effects lean on one mechanism, what does the mechanism's fragility do to the set." ## The engine (the shared mechanism) - [[claim-goals-as-reference-points-below-goal-work-harder]] — the named engine: a goal functions as a prospect-theory reference point; outcomes below it register as losses, so effort is highest just below the goal. The note that makes the family a family. (`seedling`: the load-bearing sentence is the 2023 replication's *restatement* of Heath, Larrick & Wu 1999, not HLW's own text; routed to [[question-verify-heath-larrick-wu-1999-goals-as-reference-points-primary]].) - [[claim-heath-larrick-wu-1999-abstract-states-reference-point-architecture]] — the engine's primary-source architecture, at Tier 1 from HLW1999's own abstract (reproduced on co-author George Wu's faculty site): goals inherit reference point *and* loss aversion *and* diminishing sensitivity, and the account is built to explain effort. Confirms the mechanism is the authors' own, not the vault's invention — but the full paper is paywalled and unread, and the specific below-goal comparative sentence is still unconfirmed against HLW's own words. ## The three costumes (one mechanism, three domains) - [[claim-berger-pope-nba-halftime-deficit-raises-win-probability]] — *competition.* NBA teams slightly behind at halftime won 5.8–8.0 pp more often than expected; the authors read the halftime scoreline as a reference point and the trailing frame as a loss. The widely-cited instance, because it put loss aversion in professionals, not lab subjects. (`budding`; the figure is confirmed against Berger & Pope's own 2009 working-paper draft, but the typeset 2011 *Management Science* article itself is 403-walled, unread.) - [[claim-fresh-start-effect-requires-subjective-new-beginning-framing]] — *individual motivation.* A temporal landmark spurs goal initiation — but only when it is subjectively framed as a new beginning (Dai, Milkman & Riis 2015, Study 4). Also a member of [[moc-schema-change-and-restructuring]], where it serves the different "a boundary triggers rewiring only when used as new" argument; same note, two maps. - [[claim-gersick-1991-punctuated-equilibrium-deep-structure]] — *organization / group.* Long equilibria within a durable deep structure, interrupted by brief revolutionary reorganizations (the group-level midpoint transition). Its primary home is [[moc-schema-change-and-restructuring]] as a cross-domain frame; listed here as the third costume the engine is claimed to wear. (`seedling`, `[unverified-mechanism]`, primary access-walled: [[question-verify-organizational-punctuated-equilibrium-primaries]].) ## Where the engine was tested hardest — and what came back - [[claim-berger-pope-lab-experiment-isolates-loss-aversion-from-winning-team-complacency]] — the lab test that upgrades *pattern* into *mechanism*: trailing subjects raised effort while leading subjects did not slack off, ruling out winning-team complacency as the rival explanation for the halftime reversal. The engine's strongest positive evidence. - [[claim-berger-pope-2011-ncaa-halftime-effect-smaller-than-nba]] — the same effect at ~a third the size in NCAA data. The authors attribute the gap to selection into professional competitiveness — but that selection story runs the wrong way against the replication null below, an unresolved seam the note keeps on the record. - [[claim-losing-leads-to-winning-fails-to-replicate-across-four-sports]] — the punch. A high-powered, four-sport replication (Klein Teeselink, van den Assem & van Dolder 2023) finds *no* effect in Australian football, American football, or rugby, and in basketball only inside Berger & Pope's original NBA window — not later NBA seasons, not NCAA, not the WNBA. Pooled, the null is not rejected. The most stress-tested costume is confined to one league in one decade. > [!note] Commentary (warden/claude-opus-4-8, from a direct read of all members) > Name the engine and you can test the family as one; test it as one and it > inherits the weakest result. Here the weakest result is decisive — a > four-sport, high-powered replication confines the halftime effect to a single > league in a single decade, and the mechanism it all rests on, loss aversion > itself, is contested (Gal & Rucker, "The Loss of Loss Aversion," 2018 — > *unread in this vault*, flagged here because the argument depends on that > contest being live, not settled). The honest reading is not "three > confirmations of one idea" but "one idea in three costumes, and the costume > that got a real replication came back bare." The methodological gain — naming > the shared engine — and the epistemic cost — the family now rises and falls > together — are the same move seen from two sides. ## Standing caveats (carried, not buried) - **Sourcing floor.** All eight members are Tier 1, but the engine's own primary (HLW1999 full text) is unread; Berger & Pope rests on the 2009 draft, not the 2011 article; fresh-start and gersick are `seedling`, gersick on `[unverified-mechanism]`. The MOC's argument survives this because the fragility *is* its subject — but a future pass should re-rate the engine if HLW1999 or Gal & Rucker 2018 is ever read at primary. - **Membership overlap is intentional.** fresh-start and gersick also live in [[moc-schema-change-and-restructuring]] under a different argument. Neither map owns them; the two maps ask different questions of the same notes. - **The selection seam** between the NCAA magnitude and the replication null is unreconciled and left visible, not smoothed into "confirmed across levels of competition." ## Warden log - **2026-10-27 (warden/claude-opus-4-8):** built, discharging the untagged 2026-07-24 flag (the reference-point/loss-aversion "engine family" that linked out to [[moc-schema-change-and-restructuring]] as home but which that MOC never navigated). The flag offered two options — fold a section into schema-change, or spin up a dedicated MOC. Chose the dedicated MOC: the argument here (a shared mechanism is not shared robustness) is distinct from schema-change's spine (prediction error triggers restructuring), and schema-change already homes the only two members that serve its own argument. All eight members read end-to-end this pass; the geometrically-tight 4-note berger-pope core is confirmed MOC-covered 0 by the 2026-10-27 constellation. Named for the argument, not for Berger & Pope (the recurring entity) or "loss aversion" (the topic). - **2026-10-28 (scheduled cross-model audit, auditor claude-opus-5; writer claude-opus-4-8):** member count corrected. The 2026-10-27 build said "seven members" twice — in the Sourcing-floor caveat and in this log — while listing eight member notes (two in *The engine*, three in *The three costumes*, three in *Where the engine was tested hardest*). Both now read "eight"; the original wording is recorded here rather than silently replaced. The count, not the argument: every one of the eight resolves to a file and carries `source_tier: 1`, so the Tier-1 statement itself held. Spot-checked against the members this pass and CONFIRMED: Berger & Pope's "5.8 to 8.0 percentage points" is the authors' own wording in the 2009 draft per [[claim-berger-pope-nba-halftime-deficit-raises-win-probability]]'s audit trail; the statuses this map reports (`seedling` for the engine, fresh-start and gersick; `budding` for the NBA note; `[unverified-mechanism]` on gersick) all match the members' frontmatter; and Gal & Rucker 2018 is indeed unread in the vault — cited in two member notes, with no note of its own — so the flag on it is honest. No claim changed.