July 16, 2026
Theory got ratioed by receipts
A Beautiful Theory Falls to Ugly Data
Economists’ fancy monopoly idea just got wrecked by reality — and commenters are not buying it
TLDR: A new paper tested a famous economics theory using e-book prices and found reality flatly refused to cooperate: sellers didn’t quickly drop prices the way the theory predicts. Commenters pounced, calling the idea intuitive nonsense, joking about Bitcoin and iPhones, and celebrating another beautiful theory getting mugged by facts.
An old, elegant economics idea just got dragged into the real world — and the internet is delighted by the mess. In a new paper, economist Alex Tabarrok and co-author Tim Groseclose tested a famous claim that sellers of long-lasting goods should end up slashing prices almost instantly, because buyers will just wait for the inevitable discount. They used e-book prices as the test case, since digital books are cheap to reproduce and easy to reprice. Result? Nope. Prices stayed above the basic cost of selling them, sales kept happening over time, and prices didn’t even fall neatly.
But the real fireworks were in the comments, where readers reacted with a mix of confusion, skepticism, and pure roast energy. One commenter admitted they had to look up what “MC” meant — marginal cost, basically the bare minimum cost to make one more copy — and then still came away thinking the theory sounded wildly wrong. Another basically asked, why was this ever taken seriously, if people often buy things early simply because they want them sooner? That became the thread’s big vibe: less “wow, groundbreaking” and more “wait, you needed a paper to tell you this?”
Then came the fun analogies. Bitcoin! iPhones! People tried to stress-test the theory with real-world examples, while another commenter dropped the killer line that the history of science is a “graveyard of elegant theories” destroyed by annoying facts. Brutal, funny, and honestly the perfect summary of the whole saga.
Key Points
- •The article reports publication of a paper testing the Coase Conjecture using e-book price data.
- •The Coase Conjecture predicts that a monopolist selling a durable good may be forced to price at marginal cost immediately because buyers anticipate future price cuts.
- •The authors use e-books as a real-world test case because they are durable digital goods with low marginal cost, limited resale, and quickly adjustable prices.
- •Using public-domain e-book prices as a proxy for marginal cost, the paper tests whether prices quickly fall to marginal cost and whether the market clears in the first period.
- •The article says the data do not support the conjecture: prices start above marginal cost, sales continue over multiple periods, prices do not decline monotonically, and the authors reject the conjecture decisively.