What Are Prediction Markets—and Can They Really Predict the Future?
Executive Summary
- Prediction markets let people buy and sell contracts tied to the outcomes of real-world events—elections, economic indicators, weather, sports, and geopolitical developments—with each contract’s price acting as the implied probability of the event. On major platforms such as Kalshi and Polymarket, winning contracts typically pay $1 each.
- The two leading platforms take different routes to the same idea: Kalshi operates as a federally regulated exchange under the US Commodity Futures Trading Commission (CFTC), while Polymarket runs on blockchain technology and a decentralized oracle, historically outside the US regulatory framework.
- Supporters argue that markets aggregate dispersed public information into real-time forecasts that sometimes outperform polls and expert opinion.
- Critics counter that the same incentives invite manipulation, insider trading, wagering on disasters, and a gambling-like commercialization of uncertainty.
- The industry has grown rapidly—more than $24 billion in monthly trading volume by 2026, led by sports, cryptocurrency, and politics—while regulators in the US and abroad have not reached a consensus on how these markets should be classified.
FAQ
- 1. What is a prediction market?
A prediction market is a marketplace where people buy and sell contracts tied to the outcome of future events. Each contract carries a resolution date and settlement rules; its price reflects the implied probability of the outcome, and on major platforms such as Kalshi and Polymarket, a winning contract typically pays $1.
- 2. How do prediction markets differ from sports betting?
Sportsbooks set and adjust odds using real-time data feeds, while prediction markets use a central limit order book to match buyers and sellers peer-to-peer, so prices rise or fall continuously as new information arrives—functioning as forecasting systems as well as wagering platforms.
- 3. What are the leading platforms, and how do they differ?
Kalshi (founded 2018) operates as a federally regulated exchange under CFTC oversight with strict "know your customer" rules. Polymarket (launched 2020) is built on blockchain and resolves outcomes through UMA's decentralized oracle, historically operating outside the US regulatory framework.
- 4. Are prediction markets legal?
Federal regulators generally view many prediction-market contracts as financial derivatives rather than gambling, but states differ—some challenge platforms as unlicensed gambling businesses and many restrict election wagering. Other countries take varied approaches, and no international consensus exists.
- 5. Do prediction markets actually predict better than polls?
Supporters say the markets aggregate public information into real-time forecasts that sometimes outperform polls and expert opinion. Performance varies by event, and a successful prediction does not establish that markets consistently outperform polls.
- 6. Can they be manipulated, and what about insider trading?
Yes—concerns include attempts to influence outcomes (even official weather measurements) and participants profiting from confidential government, corporate, or military information. Distinguishing legitimate expertise from unlawful insider trading is one of the industry's most persistent regulatory challenges.
- 7. How big are these markets?
By 2026 the industry generated more than $24 billion in monthly trading volume, with sports, cryptocurrency, and politics among the most popular categories—large enough that news organizations, financial firms, and professional sports leagues now watch them as real-time signals of public expectations.