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Harris’s implied probability rose sharply in a short period because Polymarket contracts are repriced continuously as traders react to news, polling and large orders. Donald Trump could still remain the favorite at that same moment: on Oct. 7, 2024, Polymarket priced a Trump win at 53.3% and a Harris win at 46.1%. Those figures were market prices, not guarantees, poll shares or official forecasts.
What happened to the Harris and Trump prices
The “eight-day high” describes a short-term improvement in Harris’s Polymarket price. The available reporting does not establish the exact percentage or the precise starting point for that eight-day comparison, so it is safer to treat the phrase as a description of momentum rather than a specific numerical benchmark.
Forbes reported that shortly after 6 p.m. EDT on Oct. 7, 2024, Polymarket priced the contracts as follows:
| Venue or measure | Trump implied probability | Harris implied probability | When |
|---|---|---|---|
| Polymarket | 53.3% | 46.1% | Shortly after 6 p.m. EDT, Oct. 7, 2024 |
| Polymarket earlier that morning | 50.9% | 48.2% | Earlier on Oct. 7, 2024 |
| Five-market aggregate | 49.1% | 50.1% | Oct. 7, 2024 |
| PredictIt | 48.6% | 51.4% | About Oct. 7, 2024 |
| Kalshi | 49% | 51% | Oct. 7, 2024 |
The Polymarket numbers therefore moved toward Trump during that day even while Harris was ahead on PredictIt, Kalshi and the five-market aggregate. The small differences from 100% reflect rounding and market pricing rather than a missing candidate.
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Why Harris could improve while Trump remained favored
Markets update every time buyers and sellers trade
A prediction-market percentage is tied to the current price of a contract that pays according to the eventual election result. If traders become more willing to buy a Harris contract, its price rises. If Trump’s contract remains more expensive than Harris’s, Trump is still the market favorite even after Harris makes a substantial gain.
This is a relative ranking, not a statement that one candidate’s probability cannot rise unless the other’s falls by exactly the same amount. Prices can move unevenly as liquidity changes, orders are filled and the displayed quotes are rounded.
News and sentiment can change faster than polls
Trading incorporates whatever participants believe is relevant at that moment, including new polling, campaign developments, fundraising information, debate reactions and expectations about turnout. Lloyd Danzig of Sharp Alpha described this mechanism as “investor sentiment surrounding then-available data” driving prices in a given moment.
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A large order can move a thin market
Axios cautioned that large individual bets can move Polymarket’s displayed odds. A sudden change can therefore reflect a new consensus, a temporary liquidity imbalance, or both. The percentage should always be read with its timestamp and venue.
How quickly Polymarket odds changed in the final stretch
Axios’s review of the 2024 campaign illustrates why a single screenshot was not a stable forecast:
| Timestamp described by Axios | Trump | Harris | What it shows |
|---|---|---|---|
| Oct. 30, 2024 | 67% | 33% | Trump had a wide market lead |
| The following Sunday | 53% | 47% | The gap narrowed sharply |
| Tuesday morning | 62% | 38% | Trump’s lead widened again |
The sequence is evidence of volatility, not proof that any one price was “the true” probability. Each number was the market’s estimate at that time.
Why Polymarket, PredictIt and Kalshi disagreed
Different venues can produce different prices for what appears to be the same election because they are not identical markets.
| Comparison factor | Why it matters |
|---|---|
| Contract wording | The exact event being settled and the definition of a winning outcome affect what traders are buying. |
| Settlement rules | Each platform’s rule for resolving disputes or unusual election outcomes can change contract value. |
| Liquidity and market depth | Orders move a deeper market less than a thin one; a displayed quote may not represent the price available for a large trade. |
| Trader composition | Participants may differ in geography, expertise, risk tolerance and political assumptions. |
| Trading limits | Position or account limits can affect who participates and how much capital reaches a price. |
| Regulatory jurisdiction | The legal structure and permitted contracts differ by platform and country. |
| What is being measured | A market price reflects wagers; a poll measures survey responses; a forecasting model combines data using its own methodology. |
For example, on Oct. 17, Forbes reported that Polymarket crossed a 60% implied Trump victory probability while Nate Silver’s model was nearly even and FiveThirtyEight gave Harris a 53% to 46% edge. That divergence does not by itself identify which source was correct; it shows that the sources answered different questions using different inputs.
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What a “60% chance” on Polymarket actually means
“Trump at 60%” means traders were pricing the relevant Trump contract at approximately 60 cents per dollar of eventual payout at that timestamp, subject to the platform’s rules and market mechanics. It does not mean Trump was certain to win, that six out of ten voters supported him, or that a poll found a 60% share.
- A 60% price still implies a substantial 40% chance of the alternative outcome.
- The price can change minutes later when new information or orders arrive.
- The price may include trading costs, liquidity effects and risk preferences, not just a pure statistical estimate.
- The contract settles according to its stated rules, which must be checked before comparing it with another venue.
Are Polymarket election odds accurate?
Prediction markets can aggregate information efficiently, but no market is a guaranteed forecast. Accuracy depends on the amount and quality of trading, the clarity of the contract, the time remaining before settlement and whether participants have better information than the public. Volatility and large bets can produce temporary mispricing.
The 2024 examples also show why “accurate” cannot be judged from one intraday number. A market price is a timestamped estimate. To evaluate performance, one would need a defined set of contracts, prices recorded over time, settlement results and a suitable statistical scoring method—not a comparison of one headline percentage with the eventual winner.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Polymarket’s current U.S. and international distinction
Current coverage should distinguish two products. The Associated Press reported in 2026 that Polymarket International is blockchain-based and cryptocurrency-funded, while Polymarket U.S. is centralized, funded in U.S. dollars, regulated by the Commodity Futures Trading Commission and offers fewer contracts. Odds from one product should not automatically be treated as quotes from the other.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteThis distinction matters when readers compare historical 2024 reports with a current page: the platform name may be similar, but the funding, regulatory framework and available markets can differ.
How to read a prediction-market headline without being misled
- Check the timestamp. Record the date, time and time zone before interpreting a percentage.
- Identify the venue and product. Confirm whether the quote is from Polymarket International, Polymarket U.S., PredictIt, Kalshi or another market.
- Read the contract. Verify the exact event and settlement rule rather than assuming every “presidential odds” contract is interchangeable.
- Call it an implied probability. Use “traders were pricing” or “the contract implied” instead of presenting the number as certainty.
- Look for liquidity context. A dramatic move may be amplified by a large order or shallow market depth.
- Compare like with like. Polls, forecasting models and wagers measure different things and should not be ranked as if they were the same statistic.
Bottom line
Harris’s rise was compatible with Trump remaining favored because Polymarket continuously repriced contracts and the Republican’s contract was still more expensive at the reported Oct. 7, 2024 snapshot. The day’s disagreement with PredictIt, Kalshi and polling models is a reminder that prediction-market odds are time-stamped market prices—not guarantees, vote shares or a single authoritative forecast.
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