A field of sixty runners is not a market, it is a portfolio
The margin on a long-range market is wider than on a match market, and it is wider for reasons that have nothing to do with honesty. Understanding those reasons is the difference between treating a long price as a bargain and treating it as what it is: an offer made by somebody who has to carry your side of it for months.
§1Margin, before anything else
Every price on a book contains an implied probability. Add those probabilities up across a complete set of outcomes and the total is above one hundred per cent. The excess is the margin, and it is how a book is paid for operating a market rather than for being right about the result.
That much is true of any market. What changes with the horizon is the size of the excess and how it is distributed. On a two-way market with a tight book the excess is small and spread evenly. On a long-range outright with a field of dozens of runners the excess is larger, it is usually not spread evenly across the field, and it sits most heavily on exactly the part of the field people are most likely to buy.
The part that surprises people
The imbalance matters more than the total. A field can be priced so that the favourite is offered close to a fair rate while the long prices carry most of the book's edge. A buyer who only ever looks at big numbers is therefore buying from the widest part of the margin without knowing it.
§2The field ladder
The ladder below is the mechanism this page is about. Each rung is a market with more possible outcomes than the one above it, and each rung is priced wider than the one above it. The reason is not that a longer field is harder to think about in the abstract. It is that a book has to publish a tradeable price on every outcome in the field, at a moment when it cannot know which of them will be contested.
Two things follow from the shape. First, a long price is not generous relative to a short one in the same field; both are set inside the same wide margin. Second, the wider the field, the more of the margin sits on the outcomes nobody argues about, which is where a casual buyer is most likely to be.
§3Why the margin has to be wide: three pressures
Three separate pressures push long-range margins up, and it is worth keeping them apart because only one of them is about the operator's own protection.
| Pressure | What it is | Effect on the price |
|---|---|---|
| Unhedgeable exposure | A book cannot lay off a nine-month position in seconds the way it can reprice a live market, so it carries the position itself. | The offered price is worse than the model alone would imply. |
| Information arriving later | The facts that decide a long market mostly do not exist when the price is published. | The book prices the possibility of surprise rather than the surprise itself. |
| Running a wide field | Every outcome in the field needs a price, including ones that will never be bought. | The cost of quoting the whole field is spread across all of it. |
None of the three is a trick. They are the arithmetic of offering a market that stays open for months, and they would be present in a market run at zero profit. The honest conclusion is not that long-range markets are rigged; it is that a long-range price is a worse price in the same sense that a longer loan is a more expensive one — not because the lender is cheating, but because time is being carried by somebody.
§4The same book, two markets
The clearest way to see the mechanism is to watch one operator price two markets about the same event. Take a team playing on the opening weekend. The match market is opened days before kick-off and stays tight from the start: two outcomes, deep book, hedgeable within the match, and a price that is contested by everyone who cares. The season-long outright involving the same team is opened months earlier and is wider throughout, even on the same day.
The team is the same team. The opinion is roughly the same opinion. What differs is the length of the exposure the book is carrying and the number of outcomes it has to price. The outright is more expensive because it is longer and wider, and that is the entire difference.
What the comparison shows
If the same opinion costs more to express in one market than in another, then the market chosen is part of the price. That is a statement about cost, not about opportunity. It also means that a position taken in the wide market needs a real reason, because it starts further behind than the same position taken in the tight one.
The reason to accept the wide market is that the thing you want to say can only be said there: no match market settles a nine-month question. The reason to hesitate is that you are paying for the length.
§5Comparing honestly
Comparisons between long-range prices are only meaningful when they are made like for like. Four conditions have to hold, and in practice they rarely all do. The market has to be the same question, with the same settlement rules — two operators can call the same market by the same name and settle it differently on a non-runner. The field has to be the same, which means the same entries at the same moment. The time has to be the same, because a price from three weeks ago is a different market. And the price has to be one you could actually have taken, not the best number shown anywhere on a comparison page.
- Same question
- Same settlement rule
- Same field, same day
- A price you could take
Where any of those fails, the comparison measures the difference between two offers, not the difference between two prices for the same thing. That is a distinction that matters most in exactly the markets this site is about, because long-range rules differ between operators far more than match-market rules do.
§6What to do with this
The honest use of this page is to stop one pattern and start another. Stop reading a big number as a bargain. Start reading it as a number set inside a wide field, by a book that has to carry the position for months, with most of its edge placed where the field is least likely to be argued about.1
That number is a cost, and it is only worth paying when the reason for the position is stronger than the cost of the horizon. Which is the same thing as saying that the interesting question about a long-range market was never the price. It is whether you have a reason that survives months without news.
- 1The rungs and bars on this page are qualitative: they show the direction a margin moves as the number of outcomes grows, and deliberately do not claim a figure for any real market, because such a figure would be invented.
Where this page stops
The partner link is sponsored and pays this site if you open an account through it. It is not a claim that any operator's margin is narrower or wider than any other's; this site does not measure that, and nobody should read a sponsored link as a comparison.
Affiliate disclosure and risk warning
Every affiliate link on this page and in the header is a sponsored link to a partner operator, and we may be paid if you open an account through it, at no extra cost to you. That link pays us; it does not improve the price you are offered, it does not shorten the time your money is committed for, and it is never a recommendation to bet. Nothing on this page is betting, financial, tax or legal advice, and no price, figure or outcome on it is a prediction. 18+ only. Betting is gambling, and long-range betting has a risk profile of its own: the stake is committed for months, a competitor who does not take part can change what the bet pays or whether it stands at all, the price you accept can move against you for a whole season without ever returning, and the operator builds a wider margin into a far-off market than into a match market. Gambling can cause serious financial harm, including debt and damage to relationships and mental health. Never stake money you cannot afford to lose, never borrow to bet, and never increase a stake to chase a loss. Free, confidential support is available in most countries from national gambling-harm helplines, for bettors and for the people around them.