The Revealed Preference for Standing Room

England's two-pound bus fare cap represents a market correction of the first order, and I say this as someone who believes markets correct nothing and that all caps are merely transfers. Consider the mechanism: the government has observed that agents are unwilling, at the current margin, to board buses at higher prices. One response is to declare this preference invalid and impose a ceiling. This is correct, actually.

On the one hand, the policy represents a sunk-cost recovery operation for the entire transit apparatus. Local authorities have committed resources to bus infrastructure; those resources are now locked in place. A rider who declines to board at three pounds but boards at two has revealed a preference not for transportation, but for destroying value to avoid the appearance of wasted government money. The cap simply makes this preference binding. Efficient.

On the other hand — and here I reverse myself only slightly — the policy creates an obvious shortage. Buses are now undersupplied at two pounds because drivers, buses, and fuel all require compensation, and at the margin, fewer agents are willing to provide these services at the constrained price. This is market logic at work: the cap causes exactly what it was designed to prevent, which means the policy is functioning perfectly as a transfer mechanism from operators to users. This is also efficient, but in the opposite direction.

But consider the third hand, which I am introducing now: the cap may not create shortage at all. Ridership may simply vanish until supply and demand equilibrate at two pounds, at which point the market has cleared, the government has achieved its stated goal, and nobody boards the bus because nobody wants to at two pounds. The riders who value buses highly enough to pay three pounds have been pushed out, replaced by riders who value buses at exactly two pounds, which is to say, riders who are indifferent to buses. The system still equilibrates. The government has simply discovered, through brute force, the true market-clearing price.

But I must reverse again: the riders who left were the sunk-cost fallers. They had already committed to transit as their mode; they were throwing good money after bad. The cap is a forced-commitment device. New riders entering at two pounds are making fresh choices on fresh information, and that information is: buses cost two pounds. Policymakers should be pleased. Agents have achieved a new equilibrium.

And yet. Every party involved — operators, riders, taxpayers, the government itself — is now holding bus infrastructure that nobody would freely choose to hold at these prices. This is called "gridlock," and it costs money. The question is only whether the gridlock is a feature or a bug, which is itself a market question, and therefore has no answer, only a price.

Money is money.