The markets are convulsing this fortnight, and the striking thing is that no single policy explains it. It is not a tariff, or a rate decision, or a war, though there are those too; it is something more diffuse and more fundamental, a sense that the ground rules everyone had built upon, the reliability of American alliances, the sanctity of contracts, the independence of institutions, the predictability of a great power's basic conduct, are dissolving all at once, and that the dissolution, rather than any particular act, is what has the markets afraid. To understand why this is a distinct and graver kind of shock than any policy could be, it helps to see clearly what those ground rules actually were, and what invisible work they had been doing all along.
The economist Douglass North won a Nobel Prize for making visible the thing this fortnight is destroying: institutions, which he defined not as organisations but as the rules of the game, the formal and informal constraints that structure human interaction and, crucially, reduce uncertainty. North's insight was that economic life is impossible without a dense scaffolding of stable expectations, that every investment, every contract, every long-term commitment rests on a set of background rules the participants trust will hold, and that these institutions, precisely because they are so reliable, become invisible, taken for granted, mistaken for the natural order of things rather than seen as the fragile human construction they are. The rule of law, the enforceability of a contract, the independence of a central bank, the predictability of a government's basic conduct: these are not features of nature but institutions, painstakingly built, and their whole economic function is to let people act as though tomorrow will resemble today, to reduce the vast uncertainty of the future to something manageable enough to invest against. When they hold, they are invisible. When they dissolve, everything that was built on the assumption of their holding must be repriced at once.
Let me put the counterargument, which the disruption's defenders press: that institutions can ossify, that some of the rules being broken were sclerotic or unfair or overdue for change, and that a certain amount of institutional disruption is the necessary price of renewal, the clearing away of arrangements that had outlived their purpose. There is truth in this; not every rule deserves to survive, and reverence for institutions can shade into mere conservatism. But North's framework exposes what this defence misses: the distinction between changing a rule through the institutions that let rules be changed predictably, and dissolving the meta-rule that rules are stable and changed only through legitimate process. Reforming a bad law through the legislature strengthens the institution of law even as it changes its content; breaking laws by executive whim, ignoring courts, tearing up treaties at will, does not reform the rules but destroys the deeper institution that rules mean anything, and that deeper institution is the one whose whole value was the reduction of uncertainty. You can change the rules of a game and still have a game. What you cannot do is make the rules themselves unpredictable and still have anyone willing to play.
And that is why this fortnight's convulsion is graver than any policy shock, and why the markets are right to be more afraid than any single number would justify. A bad policy is a move within the game, costly perhaps but priceable, because the rules that let you price it still hold. What is happening now is the dissolution of the rules themselves, the meta-institution of predictability that North identified as the foundation of all economic life, and its loss cannot be priced because pricing itself depended on it. This is what the great repricing actually is: not the market absorbing a policy but the market discovering that the ground rules it assumed were permanent were institutions after all, fragile human constructions that could be dissolved, and that the invisible scaffolding which let everyone assume tomorrow would resemble today has been pulled away, leaving every long-term commitment, every investment, every contract, suddenly exposed to an uncertainty the institutions had been quietly absorbing all along. The rules were doing more than anyone noticed, precisely because no one noticed them. The markets are learning, this fortnight, what those invisible rules were worth, by watching what happens when they go.