Trading ends; resolution begins. A separate game appears: oracles, UMA votes, exchange committees, and scoring rules that pay people to report truth—or tempt them to lie for profit.
This chapter closes Module 03 on incentivized reporting and how mechanisms push toward honest consensus (or fail spectacularly).
Two layers of truth
The trading game asks what odds trade today. The reporting game asks what outcome gets stamped at settlement. You can lose money being right about reality but wrong about oracle wording. Game theory must analyze both layers, not just the mid price.
Centralized resolution
Regulated or custodial platforms:
- Rules committee interprets criteria
- Appeals process, legal review
- Precedent library (“2020 PA call”)
Incentives:
- Platform reputation long-run
- Litigation risk if arbitrary
- Revenue needs trust
Manipulation: less about pump, more about wording fights (“inaugurated” vs “certified”).
Decentralized oracle games (crypto)
Optimistic oracle pattern:
- Proposer posts outcome + bond
- Challenge window
- If challenged, token vote or dispute court
- Losers lose bonds; winners gain
Strategy space:
- Honest report if bond < expected reward for truth
- Dishonest coalition if vote can be bought cheaply
Bribery attacks: attacker profits on NO shares while bribing voters to say YES failed—classic last-minute governance attack.
Proper scoring rules (reporting side)
the microstructure module LMSR linked to proper scoring: reporters maximize expected score by stating true beliefs.
Brier score, developed in the probability toolkit module, rewards probabilistic forecasts closer to the realized outcome.
When platforms pay forecasters (not just traders) by score:
- Truth-telling is dominant under proper scoring if beliefs sincere
- Collusion if scores pooled and reallocated—game changes
Prediction vs reporting separation
Traders move price before event.
Reporters (oracles) settle after.
Misalignment game:
- Traders price 90% YES
- Oracle committee rules NO on technicality
- “Market wrong” headline—actually resolution wedge
Always read contract text as part of reporting game.
Honest consensus as equilibrium
Consensus — enough independent reporters with aligned incentives agree on outcome.
Conditions (parallel to wisdom of crowds):
Break one—whale voter or ambiguous text—consensus fails.
Incentivized fact-checking markets
Experimental designs:
- Reporters stake on proposed outcome
- Challengers stake opposite
- Winner takes pool
Schelling point — everyone coordinates on obvious truth if wording clear; fights if muddy.
Platform interventions
Trader P&L interaction
Oracle risk premium — contracts trade below “true” probability because holders fear mis-resolution.
Discount larger when:
- History of disputes
- Subjective wording
- Low voter turnout on chain
Case archetypes
Clean sports score — Oracle = official box score; consensus easy.
Election — Multiple phases; disputes rare on regulated US venues with published criteria; crypto venues more drama.
Crypto protocol hack — “Funds stolen?” — technical evidence; voter expertise bias.
Celebrity death hoaxes — Temporary false reporting; markets halt until confirmation.
Ethical dimension
Paying for “assassination markets” or harm markets warps reporting incentives—society may ban regardless of mechanism design.
How this fits the wider curriculum
Trust and regulation from the opening module, microstructure from the liquidity module, and strategic players including reporters from this module all shape the number you trade. The probability toolkit module next quantifies forecast quality with scores like Brier and calibration.
Module synthesis
You studied strategic players and equilibria, manipulation costs, arbitrage across venues and contract trees, cascades and news jumps, and settlement honesty. Prediction markets stay useful when the trading game and reporting game both have defenses—depth, arb, clear rules, costly lies.
Before sizing a position, ask whether liquidity is adequate, manipulation budget is high on your venue, sister markets align, the contract tree is coherent, cascade risk is low, and the oracle clause is acceptable. If oracle risk is unacceptable, pass the trade regardless of mid.
You completed Module 03 — Game Theory & Economic Incentives. The next module builds the probability toolkit to score forecasts and size bets.