Only 3% of Traders Drive Prediction Market Accuracy

Polymarket study shows prediction markets work because of a tiny group of informed traders, not crowd wisdom. The Green Beret insider case may be an extreme example.

Study Findings

^ Scope: 1.72M accounts, $13.76B volume from 2023-2025Key

^ Result: 3% of traders drive price discovery and accuracy

^ Other 97%: Add liquidity but lose to the informed 3%

Skill vs Luck

Researchers ran 10K simulations per trader, flipping trade direction:

* Skill Test: Consistently beating random outcomes = skill

* Results: Only 12% of top profit makers passed

* Mean Reversion: ∼60% of "lucky winners" lost in follow-up tests

How Skilled Traders Move Markets

^ More skilled traders = higher accuracy, especially near resolution

^ React first to news like FOMC or earnings. Others don’t

^ Usually repeat players with consistent records

Insider Risk

Skill advantage raises issues when info isn’t public:

* Case: US overthrow of Nicolás Maduro in Venezuela

* Activity: 3 new Polymarket accounts bet big on "Maduro Overthrown" at 10% odds pre-operation

* Outcome: Made $630K+. Accounts went dormant. No charges filed

* Impact: Insider trades move markets 7-12x more per dollar than skilled trades, but are rare

Polymarket and Kalshi ban inside trading. Researchers say markets work due to informed traders, not crowds.

#PredictionMarkets #MarketEfficiency