If you had the “over” on the bet that over 10% of trades on the predictions market Polymarket are inauthentic, go ahead and cash in that ticket. According to a recent study from researchers at Columbia University , as much as one quarter of all trading volume happening on the platform is “artificial trading.”

The researchers looked at three years’ worth of buying and selling activity on Polymarket, which allows people to trade “contracts” related to real-world events based on the probability of a given outcome. What they found was that about 25% of those contracts were “wash trades,” which happens when a person or entity buys and sells the same contract to create fake levels of trading volume that can manipulate the market.

It’s important to note that the researchers don’t accuse Polym

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