Why Prediction Markets Move: Complete Guide
Learn the 4 types of prediction market price moves — hard information, whale orders, time decay, and correlated signals — and how to tell signal from noise.
Move Types
4
Case Studies
5
Signal Checks
4
Read Time
9 min
Quick Summary
The key takeaway from this page
Prediction market prices update in real time as traders buy and sell contracts based on new information. But not every price move means the same thing. A spike driven by a CPI release tells you something very different from a late-night swing in a thin market with no news. If you're new to prediction markets, start with how to read price levels first. This guide breaks down the four types of moves you'll encounter.
The 4 Types of Market Moves
Categorizing why prices change
Hard Information
A verifiable event (data release, court ruling, confirmed vote) gives the entire market new information at once. Most reliable signal.
Large Order (Thin Market)
A single large buy or sell order in a low-liquidity market moves price without any underlying news. Least reliable — check volume.
Time Decay
Approaching resolution with no confirming data causes prices to drift toward the market's default (usually NO). No new information required.
Correlated Signal
A move in a related market (polling, asset prices, peer platforms) shifts probability. Medium reliability — depends on correlation strength.
Real Move Examples
Five illustrative case studies
Five illustrative examples — covering each major move type.
Before You Act: 4 Questions to Ask
Quick sanity checks before trading
Is there correlated news?
If yes, likely informational. If no, check liquidity before acting.
What is the 24h volume?
Low volume means the market is more vulnerable to single-order noise.
How far is resolution?
Weeks out vs. 48 hours carry very different probability dynamics.
Did correlated markets move too?
Confirm the signal across platforms or related asset markets.
Signal vs. Noise at a Glance
Quick-reference comparison table
When a contract resolves, see exactly how markets settle and what data sources each platform uses.
| Move Type | Example Trigger | Signal Strength | When to Act |
|---|---|---|---|
| Hard Information | CPI release, court ruling | High | After data confirms |
| Large Order (Thin Market) | Single 5-figure buy, no news | Low | Wait for follow-through |
| Time Decay | No data, deadline approaching | Medium | Understand the default no |
| Correlated Signal | Poll shift, related market | Medium | Check correlation strength |
Frequently Asked Questions
4 common questions answered
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