A recent study has shed new light on the functioning of prediction markets, suggesting that a small group of informed traders plays a crucial role in driving market accuracy. This challenges the long-held notion that the collective knowledge of market participants is the primary driver of accuracy. The study, which analyzed over 1.72 million accounts and $13.76 billion in trading volume on Polymarket, found that just 3% of traders are responsible for the majority of price discovery, consistently predicting outcomes and moving prices in the right direction.
In contrast, the remaining 97% of traders tend to lose money, providing liquidity and generating volume, but ultimately being on the wrong side of trades against the informed minority. To distinguish between skill and luck, the researchers simulated each trader's bets 10,000 times, using a coin flip to determine the direction of the trade.
The results showed that only 12% of the biggest winners by raw profit consistently outperformed the benchmark, indicating that skill, rather than luck, was the primary factor driving their success. The study's findings have significant implications for our understanding of prediction markets, highlighting the importance of informed traders in driving market accuracy and raising questions about the role of insider information in these markets.