Is the popular Polymarket a good forecasting tool?

Original article by Felipe Montealegre

Original translation: Luffy, Foresight News

Once, a friend and I were discussing Robert Kennedys endorsement of Trump, and one participant confidently declared that Trumps chances of winning had increased by 2% because Polymarket predicted so. This was a good observation because the event happened quickly and there wasnt much other news to move the market. If Polymarket was an efficient market, this statement would seem to be tenable.

The problem is that Polymarket is still an inefficient emerging market that cannot predict small changes in the probability of an event (

The way efficient markets work is that a large number of investors trade based on events. If you think Robert Kennedys endorsement will increase Trumps odds by 10%, you will buy with leverage to get the expected return. If you think it will decrease Trumps odds, you will sell with leverage. The market is able to weight the average of well-thought-out forecasts to reflect the latest information.

The problem with Polymarket is that prices are affected too much by small deviations from consensus. In the market below, I think Trump has a 50% chance of winning, and Robert Kennedys endorsement bumps his chances up to 55%. The problem is that I cant actually make $1 million on a trade to make $100,000 (assuming my 50% to 55% prediction is correct) because buying a $1 million bet would cause its average price to skyrocket by 62%, and I would actually lose money if the market readjusts to 55%.

These issues can be solved with better liquidity and leveraging prediction tokens. Better liquidity would allow me to bet $1m at 50% Trump and exit at 55% with no slippage, thus making a 10% return. When a $1m bet moves the market

On the other hand, using prediction tokens can greatly improve the efficiency of Polymarket. I think the 10% return on this kind of investment is low: you have to predict correctly and take about 10% risk on the emerging crypto platform. If you think that the probability of you being right is about 80%, and if you are wrong, you lose 5%; then the final expected return is about 7%, which should be a good prediction relative to the market consensus. But the return is still too low.

Using Polymarket leverage, I was able to trade with 4x leverage and have enough money left over to pay the 5% loan interest on the lending platform. This is a more appropriate return on capital for researchers who spend energy and effort to find good trades and take risks.

In traditional markets we discuss 20bps interest rate changes because they have enough liquidity and leverage for analysts to earn high returns by correctly predicting small changes. Polymarket can discuss election odds of around 20%, or even 10%, but it cannot predict changes at the

Critics argue that Polymarket is large enough to allow the wisdom of the crowd to work. The idea is that tens of thousands of small traders, including thousands in swing states, are constantly making small bets on the election using the latest information. These investors have biases and incomplete information, but the sources of bias are uncorrelated and cancel each other out, while the market aggregates many different sources of information.

The problem with this rebuttal is that Polymarket has about 4,000 active traders betting on the US election every day, who are clustered in New York City and California and disproportionately follow the same accounts on Twitter. Of these 4,000 traders, I would expect half of them do not do a deep investigation into each investment and are simply there to benefit from “farming” the airdrops, i.e. earning Polymarket tokens through trading, as Polymarket may reward active traders with airdrops. In addition, there is the issue of centralization, as 20 traders account for 95% of Polymarket’s trading volume.

Polymarket is an excellent business and source of information. I believe it is much better at predicting major political events than polls, expert models, and some analytical articles. Polymarket has demonstrated the ability to predict big moves before major media reports, but this does not mean that Polymarket is an accurate forecasting tool.

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