When a strait closes, every nation feels the toll

The CNBC report is spare but consequential: the Strait of Hormuz is closed, Houthi attacks intensify, and the United States now urges its citizens to reconsider travel across the Middle East. I will leave the military particulars to those who have studied modern warfare. What I can speak to is the political economy of chokepoints — and what the closure of a narrow water passage means for the consumer who has never heard of the Strait at all.

A maritime strait is, in the language I would use, a natural monopoly of passage. Whoever commands it commands a toll on every vessel that would otherwise sail freely. In my own time, I argued at length that the great mercantilist companies — the East India Company foremost among them — turned chartered privilege into a private tax on the public's trade. The mechanism here is cruder but the effect identical: a sovereign, or a faction acting with a sovereign's force, interposes itself between willing buyers and willing sellers and extracts a rent. The cost does not fall on merchants alone. It falls, as all such costs ultimately do, on the consumer — on the household that pays more for fuel, for goods carried by ship, for everything that energy touches, which is to say everything.

There is a further point that I would press on those who speak only of strategic interest. The gains from free exchange are mutual. When the Strait is open, the nations that export through it and the nations that import through it both profit. Closure destroys value on both sides of the transaction. The exporting nation forfeits revenue; the importing nation forfeits supply. A blockade is not a weapon that injures only one party — it is a shared destruction, and the initiating power is rarely immune to its own instrument. I offer this not as a prediction about Iranian domestic conditions, which I cannot claim to know, but as a structural observation about what happens when force replaces voluntary exchange.

The deeper institutional question — the one I find most worth pressing — is this: what framework disciplines the passage of commerce through shared waters? In a well-ordered domestic economy, the law of contract and the authority of the courts protect exchange from the predation of the stronger party. In international commerce, no such authority sits above the contending sovereigns. This is precisely why I argued, in the Wealth of Nations, that defense is the first duty of the sovereign — not because war is glorious, but because without security of passage no exchange can be honest and no specialization can be sustained. A nation that cannot guarantee its merchants safe transit cannot reap the gains of the division of labor that the whole world's trade makes possible.

I am drawn, finally, to a caution about the response as much as the provocation. History records that when a chokepoint is threatened, the tempted remedy is restriction in kind — tariffs, counter-blockades, the whole apparatus of economic nationalism dressed up as patriotism. I would urge the opposite conclusion. The answer to a forced interruption of trade is not to embrace restriction permanently; it is to restore the institutional conditions — security, law, open passage — under which voluntary exchange can resume. The consumer's interest, which is the interest of the great mass of mankind, lies in openness. That interest is poorly served by those who would make a crisis into a permanent excuse for mercantile protection.