Favorites, longshots, and the bias every beginner pays for
The 10¢ contract feels like a lottery ticket because it is one.
Some biases are subtle. This one has been measured for seventy years, in every market anyone has bothered to check, and it has survived every one of those measurements: the crowd systematically overpays for longshots.
Read the gap at the left end. Contracts priced like 10% shots that come in 6% of the time. Priced like 5%, arrive at 2. Meanwhile the favorite end hugs the diagonal: the boring chalk is priced roughly right. The market, taken as a whole, is a machine that slightly flatters underdogs and gets the giants about correct.
Why the bias won’t die
Because it’s fun, and fun is load-bearing. A 10¢ contract is a ten-bagger if it hits, a rounding error if it doesn’t, and a story either way. The pain of a longshot missing is so small that its lesson never gets learned; the memory of the one that hit is permanent. Nobody tells the story of the 92% favorite that won by three scores, even though holding it was the better trade. Every fall Saturday mints new believers, and the long end of the board stays exactly where it is.
The market pays you to be boring, and charges admission for excitement.
What our desk does about it
This bias is written into our own publication rules. Our college football model refuses to publish a call above a 0.97 probability. Not because the model can’t print a bigger number, but because games that lopsided are so rare that the number could never be checked against enough outcomes to be graded honestly. At the other extreme, when our futures board names a longshot for the national championship, it is named as exactly that: a longshot, a word, a tier. Never dressed up as value with a percentage of flattery on it.
Your takeaway as a beginner is almost insultingly simple: when your eye is drawn to the cheap end of the board (and it will be, weekly), assume the price is againstyou until you have specific, checkable reasons to believe otherwise. “It feels live” is the bias talking. “Their backup quarterback beat this exact defensive scheme twice already” is at least the start of a reason. Most weeks you won’t have one, and the correct number of longshot trades will be zero.
Frequently asked questions
- What is the favorite-longshot bias?
- The most consistently measured mispricing in sports markets: longshots come in less often than their prices imply, while heavy favorites do about as well as or slightly better than theirs. In contract terms, the cheap end of the board tends to be expensive per point of real probability, and the dear end fair.
- Why do people overpay for longshots?
- Because the trade feels wonderful: a small outlay, a huge payoff, a story if it hits. Loss when it misses is tiny and instantly forgotten, so the lesson never lands. Multiply that psychology across every participant and the long end of the board stays permanently overpriced.
- Are heavy favorites a better deal than longshots?
- Historically the pricing at the favorite end has been closer to fair; that's the other half of the bias. But a fair price is not a guaranteed win: a 90% favorite still loses one time in ten, and chapter 8's sizing discipline matters more at high probabilities, not less, because the losses arrive rarely and land hard.
Take the whole guide with you
Sign up for the daily desk email and all nine chapters arrive as a designed PDF. One email a day, our graded numbers, unsubscribe anytime.
Already on the list? Download the PDF. And as everywhere on Maiden: these are probabilities and mechanics, graded in public. Nothing here is betting advice.