Prediction markets have grown into a US$44B industry, but insider trading scandals raise questions about their future.
Background:
Betting on world events isn't new. Renaissance Europeans wagered on who'd be the next Pope, and early American newspapers used betting odds to call elections before polls existed.
But the modern industry starts in 1988, when three economists in Iowa City had an idea after an election upset: what if people could bet real money on election outcomes?
They built the Iowa Electronic Markets, a campus-run exchange where punters could stake up to $500 on election results.
When the next votes came in, their little experiment out-predicted Gallup, Harris and the CBS/New York Times polls. Regulators let it slide as long as it stayed small and academic.
Over the following decades it kept winning, closer to the result than the polls 74% of the time across 1988-2004. That idea is now a $44 billion industry.
So it's clear that when people put their own money on the line, they bet on what they actually think will happen.
Where we're at today:
By 2025, there were two players who dominated the market:
Together they handle roughly 97.5% of global prediction market money, processing over $44 billion last year.
And clearly investors have noticed too - Kalshi raised $1 billion at a $22 billion valuation, while Polymarket is raising at around $15 billion. Robinhood has partnered with Kalshi to offer over 1,000 markets, from Fed rate calls to World Cup winners.
But there's a problem: what happens when a bettor already knows the outcome?
Meet Gannon Ken Van Dyke, a US Army Special Forces soldier involved in planning the secret mission to capture Venezuela's Maduro. He allegedly bet $33,000 on Polymarket that Maduro would fall, and pocketed over $400,000. He's now facing fraud charges, and there are no rules written specifically for this.
Where to from here:
Investment bank Bernstein reckons prediction markets will hit $1 trillion in trading volume by 2030, growing at roughly 80% a year.
Right now most bets are sports-related, but the next wave is economic: interest rates, company decisions, government policy.
Not everyone's on board though. Belgium, France and Italy have banned Polymarket, and new EU rules land this July.
Meanwhile, Google Finance is piping live prediction odds straight into search results. For example, someone can ask "will the RBA cut rates?" and you'll get: market says 73%.
These markets are becoming a live, real-time read on what the world thinks happens next, shaping decisions like fixing your mortgage or booking that trip.
So, the big question is whether these prediction markets are actually the future of finance or just the world's most sophisticated casino? The jury is still out.
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