{"id":1156,"slug":"spence-1973-job-market-signaling","title":"Spence 1973 (QJE) — job-market signaling; signals work only when costlier for low-quality types to acquire than high-quality types; cost-drop collapses pooling equilibrium","kind":"reference","scope":"business","status":"current","audiences":["kevin","candid-team"],"topics":["psychology-aversion","signalling-theory"],"reference_body":"**Claim:** Spence (1973), \"Job Market Signaling,\" established that in markets with asymmetric information, **signals work only if they are costlier for low-quality types to acquire than for high-quality types**. Education, in Spence's original setup, signals not because it teaches productive skills but because it is **harder for low-ability workers to complete**.\n\nThe model produces an equilibrium logic: **signals are valuable in proportion to their differential cost**. When the cost of producing a signal drops, the signal loses informational value and reverts to a **pooling equilibrium** where everyone emits it and it conveys nothing.\n\n**Source:** Spence, M. (1973). \"Job Market Signaling.\" *Quarterly Journal of Economics* 87(3), 355–374.\n\n**Confidence:** Verified (foundational paper; Spence won the 2001 Nobel partly for this work).\n\n**For Candid:** Spence's framework is the analytical chassis for [[signalling-theory-applied-ontario-credential-stack]], [[best-of-houzz-low-cost-engagement-driven-signal]], and [[audit-gap-problem-pooling-equilibrium-degradation]]. Operational distillation: **costly signals retain value; cheap signals devalue toward zero**. The Candid pitch should sit alongside costly signals (HCRA, Gold Seal, Tarion-enrolled clients, audited case studies) and **not** alongside cheap signals (pay-to-play lists, undifferentiated badges) — because the cheap signal contaminates the credible signals around it ([[audit-gap-problem-pooling-equilibrium-degradation]]).","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"}],"incoming":[{"slug":"signalling-theory-applied-ontario-credential-stack","title":"Signalling theory applied to Ontario credentials — HCRA / Tarion / Gold Seal / Guildmaster are costly; RenoMark moderate; Houzz / pay-to-play approach zero","kind":"reference","scope":"business","link_type":"depends-on"},{"slug":"audit-gap-problem-pooling-equilibrium-degradation","title":"Audit-gap problem — visual badge similarity collapses Spence pooling equilibrium; sophisticated buyers discount badge category and ask for underlying audit","kind":"reference","scope":"business","link_type":"depends-on"},{"slug":"rule-earn-one-audit-verified-credential-per-year-refuse-purchased","title":"R4 — Earn one audit-verified in-group credential per year; refuse all purchased credentials; sparse + verifiable beats dense + decorative","kind":"rule","scope":"business","link_type":"depends-on"},{"slug":"rule-build-candid-audited-reputation-infrastructure","title":"R6 — Build Candid's own audited-reputation infrastructure (GuildQuality-style for marketing-agency-for-trades); the category lacks one — structural-hole opportunity","kind":"rule","scope":"business","link_type":"depends-on"}]},"created_at":"2026-05-25T13:34:11.210Z","updated_at":"2026-05-25T13:34:11.210Z"}