A market that lives for months has three lives, not one

§1The opening: a market with almost no money in it

A long-range market opens long before anybody can say much about it. The field is nominally complete, the entries may not be, the schedule may not be final, and the operator is publishing a price anyway. At that point it is the operator's opinion, adjusted by whatever a small number of early buyers and sellers have done to it.

Depth at the opening is thin in a specific sense: the amounts that can be matched at the quoted price are small, so a modest amount of money moves the price noticeably. A book that is thin in that way behaves differently from one that is deep, and the difference is not that one is right and one is wrong; it is that one absorbs an opinion and the other transmits it.

Two things are consistently true of early prices. The margin is at its widest, because the operator is carrying the most unhedgeable exposure. And the price is at its least anchored, because the most information is still ahead.

§2The long middle: months in which very little happens

Between the opening and the closing window sits the part of a long market's life that almost nobody plans for: months in which nothing is decided and very little is learned. This is where an antepost position spends most of its time, and it is the phase that makes long-range betting emotionally unlike anything else on a sportsbook.

Prices do not drift smoothly through the middle. They mostly sit still, and then move in a step when a fact arrives — a transfer, a fitness report, a draw, a coaching change, a rule change, the withdrawal of an entry. Between the steps there is nothing to do, and that nothing is the point: a long-range position is not a thing you manage, it is a thing you wait on.

The practical consequence is a trap that is easy to fall into and hard to notice. Because nothing happens for weeks, the position invites attention — checking it, reading about it, and re-deciding. Each of those is a chance to make a second decision at a worse price than the first one, on a market where the exit is expensive.

What moves a far-off price sets out the four kinds of fact that do it, and leaving a long position covers what it costs when you decide you no longer want the bet.

§3The dead stretch, and why it is not neutral

Every long-range season has a stretch in which the market is open, priced, available to buy, and almost certainly wrong — because the information that will settle it does not exist yet. In many sports this is the off-season: squads are unsettled, schedules are provisional, and prices sit where they were left.

It is tempting to read a quiet market as a cheap one. The honest reading is narrower. A quiet market is one in which the price has not been contested, which means both that it may have been left stale and that nobody has found a reason to correct it. Those two possibilities look identical from outside and are the reason a quiet price is not the same thing as a good one.

§4The closing window: when the market becomes what it was always about

In the last days before the event, and for a season-long market in the last days before the season starts, everything about the market changes at once. The field is final. Entries are confirmed. Line-ups are knowable. Depth rises sharply, because the people who care about the outcome are now buying, and the margin narrows, because the operator can finally hedge.

This is the phase in which a long-range position meets reality. A price taken months earlier is now compared against a much tighter market, and the comparison is often uncomfortable in both directions: a position that has shortened looks brilliant and cannot be repeated, and a position that has drifted looks foolish even though the reasoning behind it has not changed.

§5The three phases together

Placed side by side the phases make one point more clearly than any of them makes alone: the thing you are buying changes underneath you. Buying the opening is buying an opinion on an unsettled field at the widest margin of the market's life. Buying the close is buying a settled field at a tight margin after everyone else has looked. Neither is wrong. They are different trades that happen to share a name.

§6Reading a horizon before you buy anything

A reader who does nothing else with this page can do this much: before taking a long price, identify the phase it sits in and ask what the price is actually made of there. That single question replaces most of the folk wisdom about buying early.

Three questions do most of the work. How much of the field is real — are the entries confirmed, the schedule fixed, the eligibility rules decided? Who else is in the market — is this a price somebody contested, or one that has been left alone for weeks? And what would have to be learned for it to move — if nothing can be learned for three months, the price is unlikely to be challenged for three months, for better and for worse.¹

1. 1The phases are described qualitatively on purpose. No figure is given for how wide a margin is in any phase, because such a figure depends on the market, the operator and the field, and would be a fabricated measurement rather than a description of a mechanism.