An individual or entity purchased over 4.5 million Trump contracts on Polymarket for the 2024 Presidential Election, causing a brief mispricing and pushing the odds to 99%. The buyer spent over $3 million in a short period, leading to a temporary skew in the order book. The anomaly occurred due to the mechanics of the order book on Polymarket. The rest of the buyer's bets were placed at varying prices. The slippage occurred because the odds on Polymarket are dynamic and change with each trade. The order book on Polymarket allows for price discovery and provides liquidity, but a market buy can result in bids getting filled at higher prices. The election winner bet is the largest on Polymarket, with Trump leading the odds at 63% and Kamala Harris at 36%.



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