Picture two petrol stations facing each other across a junction. One drops its price by 2p a litre. Within the hour, the other matches it. Within a day, both have quietly crept back up together. Nobody met. Nobody called. And yet somehow they moved as one.
That is not competition. That is something much older and considerably stranger.
The Roman Who Named It First
The word is "cartel", from the Latin *cartellum*, which just meant a small piece of paper – specifically the written agreement that rival soldiers used to set the terms for exchanging prisoners. Neat, formal, understood by both sides. By the time it filtered into commerce via German trading guilds in the 19th century, the meaning had drifted only slightly: rivals agreeing, in writing or otherwise, on exactly how not to compete with each other.
The most famous cartels were cheerfully open about it. German steel firms in the 1880s published their price agreements like football fixtures. American oil refiners divided up geographic territory and shook hands on it over lunch. This was not considered scandalous. It was called "rationalisation".
The Map You Don't Get to See
The geographic carve-up is probably the easiest version to picture. Company A takes the north, Company B takes the south, and both agree – usually silently, occasionally in writing until that became illegal – that they will not poach from each other's patch. The customer in the north never knows there is a cheaper option in the south, because the option is not actually available to them.
The pharmaceutical distribution industry has run variants of this for decades. So has commercial waste collection. So has the supply of certain construction materials to local authorities. The price feels competitive because there are technically multiple suppliers. There just aren't multiple suppliers *to you*, in *your postcode*, at the moment you're buying.
Is tacit price matching illegal in the UK?
Even without territory deals, industries develop what economists call "tacit coordination" – which is a very tidy phrase for "everyone watches everyone else and nobody blinks first". Airlines do it with fuel surcharges. Supermarkets do it with bread. A price floor quietly establishes itself: not through agreement, but through mutual understanding that going below it hurts everyone.
This is notoriously hard to prosecute because no crime has technically been committed. Two competitors both deciding, independently, that £3.50 is the sensible price for something is not illegal. Two competitors calling each other to agree on £3.50 is. The line between reading the market and rigging it turns out to be extremely thin, and a great deal of ordinary commerce sits directly on top of it.
What Competition Actually Looks Like When It's Real
Genuine price competition is surprisingly rare. When it breaks out, it's genuinely brutal. Supermarket price wars shred margins across an entire sector for years. Budget airlines essentially destroyed the economics of short-haul flying for everyone, including themselves for a while.
Which is perhaps why most industries eventually find a way to avoid it – not by meeting in a smoke-filled room, but by learning to read the same signals, follow the same logic, and leave each other's prices politely alone. The market is still there. It just had a quiet word with itself first.
Questions this raises
- How does the CMA prove a cartel exists?
- Why do petrol prices rise faster than they fall?
- What penalties do UK firms face for price fixing?
