Estimating and ranking items by value are skills as old as trade itself. In Sumerian Mesopotamia, around 3000 BC, clay tablets from Uruk already listed prices for barley, copper, and livestock, enabling merchants to compare relative values. In ancient Greece, Aristotle distinguished between "use value" and "exchange value" in the Nicomachean Ethics (c. 350 BC), laying the groundwork for thinking about price hierarchies. Roman merchants relied on Diocletian's Edict on Maximum Prices (AD 301), a decree setting price ceilings for over 1,200 products and services — the first known price catalog in history.
During the Middle Ages, the Champagne fairs (12th–13th centuries) became the center of European commerce, where merchants from across Europe had to master the relative prices of hundreds of goods — Flemish cloth, Eastern spices, Italian silks — in dozens of different currencies. The mathematician Fibonacci, in his Liber Abaci (1202), taught precisely these conversions and price comparisons, providing Pisan merchants with arithmetic tools to rank trade values.
The price ranking game entered popular culture through American television. On November 26, 1956, Bob Barker hosted The Price Is Right on NBC for the first time, created by Mark Goodson and Bill Todman. The show, which asked contestants to estimate and rank prices, became the longest-running game show in American television history, with over 9,000 episodes on CBS since 1972. In France, Le Juste Prix, adapted by TF1 in 1988 and hosted by Vincent Lagaf', attracted up to 7 million viewers and popularized price estimation games across the country.
Ranking items is also a fundamental problem in computer science. John von Neumann designed merge sort in 1945 for the EDVAC program. Tony Hoare invented quicksort in 1960 at the age of 26 — an algorithm so elegant it remains one of the most widely used in the world. But when a human ranks objects by price, they use none of these formal algorithms. The brain proceeds through approximate comparisons and mental "insertion sort," placing each new element into an existing ordered list, a method formalized by John Mauchly in the 1940s.
The work of Daniel Kahneman and Amos Tversky, awarded the Nobel Prize in Economics in 2002, revealed the cognitive biases that distort our price estimation. The anchoring bias, described in their landmark 1974 paper in Science, means the first price seen influences all subsequent ones. The endowment effect, identified by Richard Thaler (Nobel 2017), leads us to overvalue objects we own. Psychologist George Miller showed in 1956 in "The Magical Number Seven, Plus or Minus Two" that our working memory can only handle about seven items — which is why ranking 4 objects feels easy but moving to 6 dramatically increases the difficulty.
In the digital age, price estimation games are experiencing a spectacular revival. The Higher Lower Game, created by British developer Jack Sheridan in 2016, surpassed 100 million games played. On TikTok, "guess the price" videos have accumulated billions of views. The global quiz and trivia game market, including estimation games, was worth 8.3 billion dollars in 2024. E-commerce apps like Amazon use price sorting algorithms billions of times daily, while researchers at MIT and Stanford develop "price cognition" models to understand how the human brain intuitively evaluates prices.