Prediction Market Risk: Resolution, Liquidity, Reflexivity
Most prediction-market losses are not direction losses. They are structural losses caused by ambiguous resolution criteria, illiquid contracts, and reflexive feedback between markets and the events they price. A trader can be directionally correct and still lose money if the contract resolves on a technicality, the spread eats half the position, or the market moves the outcome it was supposed to predict. These three risks — resolution, liquidity, reflexivity — are the structural friction layer that separates clean information markets from messy ones.
Resolution Risk
Every prediction market resolves against specific criteria, written in advance. The exact language of the criteria determines the payout. “Will Country X enter a recession?” can resolve very differently depending on whether the definition is two consecutive quarters of negative GDP, NBER declaration, or some other source. Reading the resolution language is more important than reading the headlines. Most retail losses on prediction markets come from a directional view that was correct in spirit but failed against the specific resolution wording.
Common Resolution Failures
- Source ambiguity: which data source defines the event (BLS vs Bloomberg vs Reuters)
- Timing ambiguity: when does the resolution window close (midnight UTC? end of trading day? when officially announced?)
- Edge cases: what happens if the event “partially” occurs
- Cancellation defaults: some contracts resolve at a default price if the event cannot be determined, favoring one side asymmetrically
Each of these is a real failure mode that has cost traders money in venues that retail considered “clean.”
Liquidity Risk
Bid-ask spreads on prediction markets can be 5–15% on smaller contracts. A round trip on a 10% spread requires the underlying probability to move 10 percentage points just to break even. Open interest matters as much as volume — a contract with $50K open interest is not a venue for $10K positions. Slippage on large orders can move the implied probability significantly. The cleanest information market becomes the dirtiest trade if liquidity is misjudged.
Reflexivity Risk
Some prediction markets influence the outcomes they predict. Political prediction markets influence media narratives. Sports markets influence betting volume. Weather markets influence operational decisions in some industries. For most contracts reflexivity is minor; for some — election outcomes near critical moments, contested geopolitical events — it becomes significant. Reflexivity does not invalidate the market, but it does mean prices can detach from base-rate probabilities for reasons that have nothing to do with the underlying event.
The Closelook Risk Filter
Before any prediction-market position, four checks:
- Read the resolution language. Twice. Identify every word that could be contested.
- Check the bid-ask spread and open interest at the size being considered. If the spread is wider than the expected edge, the trade is dead before entry.
- Identify reflexivity. Does trading volume itself affect the outcome? If yes, the market is not pricing the event — it is participating in it.
- Calibrate against the base rate. A contract priced far from base rate needs a specific information edge to justify the position. “Feels right” is not an edge.