{"id":1148,"slug":"why-in-group-dominates-three-compounding-mechanisms","title":"Why in-group reputation dominates market reputation for trades — credence-good + loss-aversion + low-frequency selection compound","kind":"reference","scope":"business","status":"current","audiences":["kevin","candid-team"],"topics":["gc-vertical","psychology-aversion","credence-goods","signalling-theory"],"reference_body":"**Claim (synthesis):** Three mechanisms compound to make in-group reputation dominate market reputation in trades.\n\n**1. The credence-good problem.** Marketing services for a trades business are a credence good ([[marketing-services-as-credence-good-for-gc]], [[darby-karni-1973-credence-goods-framework]]) — the GC cannot tell whether a website redesign was \"good marketing\" or merely a good-looking website. Dulleck-Kerschbamer-Sutter 2011 ([[dulleck-kerschbamer-sutter-2011-liability-verifiability-credence-goods]]) found experimentally that \"allowing sellers to build up reputation has little influence\" on credence-good market efficiency in the absence of liability. **Reputation alone — particularly the market kind, which is unspecific — does not solve the credence-good problem.** What solves it is liability (Tarion for new home construction) plus informed-peer review (in-group reputation for vendors that are not regulated).\n\n**2. Risk-aversion structure.** A GC choosing a marketing vendor has substantial downside (wasted budget, lost season, brand damage) and bounded upside (a slightly higher close rate). Loss-averse buyers ([[kahneman-tversky-prospect-theory-loss-aversion-2to1]], [[brown-imai-vieider-camerer-2024-meta-analysis-lambda-1955]]) weight unfakeable in-group information higher and discount fakeable market signals.\n\n**3. Frequency structure.** A GC selects a marketing vendor perhaps every **three to seven years**. Repeated low-frequency decisions cannot be learned by trial and error. They are made by **surrogacy** — the buyer outsources the decision to a trusted peer who has made it more recently.\n\n**Confidence:** Synthesis of verified mechanisms; in-domain application is Directional.\n\n**For Candid:** This is the theory of why marketing assets without network membership are noise. The buyer is operating in a regime where the unfakeable signal dominates the fakeable signal, the loss-domain weighting amplifies the asymmetry, and the low-frequency decision cycle forces reliance on surrogate-peer judgment.","rationale_body":null,"metadata":null,"links":{"outgoing":[{"slug":"research-brief-trust-networks-in-group-reputation-may-2026","title":"Research brief: trust, referral networks, and in-group reputation in Ontario's trades economy (May 2026 — Foundation Brief #3)","kind":"reference","scope":"business","link_type":"relates-to"},{"slug":"dulleck-kerschbamer-sutter-2011-liability-verifiability-credence-goods","title":"Dulleck, Kerschbamer, Sutter 2011 (AER) — credence-goods lab experiment; \"liability has crucial effect, verifiability minor, reputation little influence\"","kind":"reference","scope":"business","link_type":"depends-on"},{"slug":"darby-karni-1973-credence-goods-framework","title":"Darby & Karni (J Law Econ 1973) — \"credence good\": quality consumers never discover even after consumption","kind":"reference","scope":"business","link_type":"depends-on"},{"slug":"marketing-services-as-credence-good-for-gc","title":"Marketing services are a near-paradigmatic credence good for a GC buyer","kind":"reference","scope":"business","link_type":"depends-on"},{"slug":"kahneman-tversky-prospect-theory-loss-aversion-2to1","title":"Kahneman & Tversky prospect theory (Econometrica 1979; JRU 1992) — loss aversion ratio ~2:1; fourfold pattern; certainty effect","kind":"reference","scope":"business","link_type":"depends-on"}],"incoming":[{"slug":"rule-reweight-marketing-portfolio-toward-in-group-accrual","title":"R2 — Reweight marketing portfolio toward in-group reputation accrual; reduce reliance on homeowner-targeted lead-gen and agency-directory listings","kind":"rule","scope":"business","link_type":"depends-on"},{"slug":"rule-treat-events-as-reputation-witnessing-not-lead-generation","title":"R7 — Treat events as reputation-witnessing infrastructure, not lead-generation; measure share-of-voice within defined in-group, not leads-attributed-to-event","kind":"rule","scope":"business","link_type":"depends-on"}]},"created_at":"2026-05-25T13:34:11.178Z","updated_at":"2026-05-25T13:34:11.178Z"}