A recent scandal involving a Green Beret who was arrested for betting on a classified U.S. raid may be more than just an isolated incident. According to a new study, it may be an extreme example of the small group of informed traders who actually influence prices on platforms like Polymarket, while the majority of users incur losses. The study, which analyzed 1.72 million accounts and $13.76 billion in trading volume on Polymarket, discovered 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 largely fail to do so, instead providing liquidity and generating volume while ultimately losing money to the informed minority. The researchers used a novel approach to distinguish between skill and luck, rerunning each trader's bets 10,000 times with the direction of the bet randomized. The results showed that among the biggest winners, only 12% consistently outperformed the benchmark, while many apparent winners were found to be lucky rather than skilled. The study's findings have significant implications for our understanding of how prediction markets work, suggesting that it is the actions of a small group of informed traders that drive market accuracy, rather than the collective knowledge of the crowd.
Furthermore, the research highlights the risk of insider trading, where individuals with access to non-public information can use this knowledge to make profitable trades, potentially undermining the integrity of the market. The study's authors found that insider trades, while rare, can have a significant impact on prices, moving them more aggressively than typical skilled trades. However, they also noted that most of the time, the market's accuracy still depends on repeat traders who consistently outperform, rather than on one-off bets.