Imagine you and a friend disagree: will a certain team win the championship? One says yes and puts down $100, the other says no and does the same. Winner takes all.
A prediction market is the same idea — scaled to thousands of people, and open to almost any question: who wins the election, will the new iPhone ship this year, will oil prices rise.
With one key difference from a bet: you’re not locked in. Positions trade like stocks — you can sell yours at any moment, before the outcome is known.
How it works in practice
You open a platform — say, Polymarket — and see a question: “Will Candidate X win the election?” Next to it, a price: $0.65.
That price is the crowd’s forecast. $0.65 means the market puts the probability at 65%. Agree? Buy. Think the market is wrong? Sell.
When the event resolves, the correct answer pays $1. The wrong one goes to $0.
Why it beats polls
A poll asks: “What do you think?” People answer without much thought.
A prediction market asks: “Would you put money on it?” That changes everything. With real money at stake, people think harder, check facts, and don’t say things they don’t believe.
The result: thousands of people, each with their own piece of information, produce a forecast that’s often more accurate than any single expert. This is called the wisdom of crowds.
Is it legal?
It depends on where you live — and it’s evolving fast. In the US, regulated platforms like Kalshi (licensed by the CFTC, the federal derivatives regulator) and Polymarket US operate legally, though some states are challenging them in court. The international Polymarket exchange is not available to US residents. Most other countries fall somewhere in between. I keep an updated breakdown in the Platforms section.
Where to start
The easiest way in: open Polymarket or Metaculus and just browse the active markets. No registration needed to look. In upcoming articles, we’ll break down each platform in detail.
Nothing here is financial advice. Prediction markets involve risk — never trade money you can’t afford to lose.