Auction Game Pricing: How to Estimate Hammer Prices for Famous Lots

The Auction Game asks a deceptively simple question: how much did this thing actually sell for? Every lot in the game is a real object with a real hammer price, from a da Vinci painting that sold for over 450 million dollars to a guitar that sold for about 6 million. Your job is to place your estimate on a scale that runs from 1 million to 500 million dollars. The spread is enormous, and that is the whole point. The game does not test whether you know exact prices. It tests whether you can think in orders of magnitude, recognise what kind of object you are looking at, and avoid the biases that make most people guess badly.

This guide explains how the slider works, how to anchor your estimates, what each category of lot is typically worth, and the mistakes that cost the most points.

The Slider Is Logarithmic, So Think in Multiples

The most important mechanic in the game is the slider, and it is logarithmic. That is not a quirk, it is a necessity. The lots range from about 6 million dollars to over 450 million, which is a spread of roughly 75 times from the cheapest to the most expensive. On a linear slider, the entire bottom half of the range would be squeezed into a sliver, and you would have no fine control where most of the lots actually sit. On a log slider, equal distances mean equal multiples: moving the same distance doubles the price, whether you are at 6 million or at 60 million.

The practical consequence is that you should estimate in multiples, not in additions. Do not think "a bit more than 10 million." Think "twice 10 million," or "half of 100 million." The useful landmarks on the scale are the round multiples: 5, 10, 20, 50, 100 and 200 million. If you can place a lot within the right doubling band, you are already doing well, because most bad estimates in this game are wrong by a factor of three or more, not by a few percent.

The slider is for the order of magnitude. Once you have the band right, type the exact number to fine tune it. That two-step routine, slider first for the size, typing second for the precision, is the fastest way to play.

Anchor on the Extremes First

Before you estimate any lot, fix the two ends of the scale in your mind. The top of the game is the Leonardo da Vinci painting, which sold for over 450 million dollars in 2017. It is the most expensive lot in the game and close to the most expensive painting ever sold at auction. Nothing else in the game comes near it. The bottom of the game is the Kurt Cobain guitar, the Martin D-18E from the 1993 concert, which sold for about 6 million dollars in 2020. Everything else sits between those two points.

Anchors work because they turn an open question into a comparison. Instead of asking "what is this worth," you ask "is this closer to the da Vinci or to the guitar, and by how much?" A 59.6-carat pink diamond is obviously much closer to the top than to the bottom, and a first edition natural history book is closer to the bottom, because even a famous book is a book. The anchor does not give you the number, but it stops you from placing a 20 million dollar object at 200 million, which is the kind of error that ruins a round.

Category Sense: What Each Kind of Lot Is Worth

Different kinds of objects live in different price bands, and knowing those bands is the fastest way to improve. The lots in the game fall into a handful of categories, and each one has its own logic.

Old master paintings sit at the top. A Leonardo is the extreme case, but any major old master with a famous name and a clean history can reach nine figures. The reason is scarcity: there are very few Leonardos, and the buyers are museums and billionaires who compete for the same handful of works. When you see a painting by a household name, start high.

Jewels and coloured diamonds sit just below the paintings. A large pink diamond is a portable store of value with almost no supply, and auction houses treat it as an asset class. Expect tens of millions at minimum, and well into nine figures for a stone with a famous name and a large carat weight.

Classic cars occupy a wide band. A famous race car with real history can reach tens of millions, while a beautiful but less historic car sits much lower. The key question is provenance: who drove it, what did it win, and is the history documented? A car with a story is worth several times a car without one.

Sports memorabilia is the most variable category in the game. A jersey from a famous finals game and a legendary baseball card can both reach tens of millions, but not every famous athlete's item is worth a fortune. Judge the specific object and the specific moment, not the sport in general.

Manuscripts, books, stamps and fossils sit lower, but they are not cheap. A Leonardo science manuscript bought by Bill Gates, a first edition natural history book, the world's rarest stamp and a 67-million-year-old dinosaur skeleton each sold for millions to tens of millions of dollars. The lesson is that rarity and a good story lift even humble categories into the millions. A fossil is not a painting, but a famous skeleton with a name and a sale year is a museum piece, and museums pay serious money.

The practical rule across all categories is to ask two questions before you touch the slider. First, how many of these exist? Second, who would compete to buy it? The fewer that exist, and the richer the competing buyers, the higher the price. A unique painting beats a rare stamp, and a rare stamp beats a common book, because the buyer pool and the supply are what set the level.

Common Biases That Wreck Estimates

Four biases account for most bad estimates, and all four are avoidable once you can name them.

The first is fame bias: assuming that the most famous object is the most expensive. Fame helps, but it is not the price. A guitar owned by a rock legend is famous around the world and still sold for about 6 million, while a painting many people could not name sold for over 450 million. Category and scarcity matter more than how many people have heard of the object.

The second is recency bias: assuming that a recent sale must be a bigger sale. The year a lot sold tells you almost nothing about its price. A 1994 manuscript purchase and a 2022 baseball card sale can sit at very different levels, and the date is not the reason. Ignore the year unless you are using it to recall the specific sale.

The third is round number anchoring: guessing 100 million because it is a satisfying number. The true prices of these lots are almost never round numbers, and the slider rewards you for thinking in bands rather than in neat figures. If your estimate ends in a round number every time, you are guessing the number, not the object.

The fourth is confusing the estimate with the record. The da Vinci is the record, not the norm. Most lots in the game cluster far below it, and the typical lot is worth tens of millions, not hundreds. If you find yourself placing most lots above 100 million, your scale is shifted upward, and the anchors from the earlier section are the fix.

A Routine for Every Lot

Put it together into a routine you can run in seconds. First, read the description and name the category: painting, diamond, car, sports item, manuscript, book, stamp or fossil. Second, place it against the anchors: closer to the da Vinci, closer to the guitar, or near the 50 million middle? Third, adjust for the specifics: a famous name, a unique story or a documented history pushes the estimate up within its band, while an ordinary example of its kind pulls it down. Fourth, set the slider to the band, then type the exact number. Fifth, and only if you have time, sanity check the result by asking whether the object could plausibly be worth ten times more or ten times less. If both seem absurd, your band is probably right.

That routine will not make every estimate exact, and it does not need to. Being in the right band on most lots beats being exact on one and wildly wrong on the rest.

Related Games

Try your estimates in the Auction Game, and find more games on the FunWonder home page.