Group IIThe Quantities
The magnitudes a market is forever trying to count — the value of one more, the value beyond the price, the want a price is built to register, and the wealth that is held rather than earned. The question that orders the group is simple and uncomfortable: what, exactly, is economics counting when it counts?
The first group weighed the prices and found each to be a verdict — on a contest, a power, a history — rather than a fact of nature. This group turns from the verdicts to the magnitudes they are verdicts about: the quantities a market is forever trying to count. There are four of them. The value of one more. The value an exchange leaves on the table. The want a price is built to register. And the wealth that is held rather than earned.
What orders the volumes is an awkwardness they share. Each of the four is foundational, and each is, in its own way, unmeasurable. The margin governs every price, yet may be a calculation no living chooser ever performs. The surplus is real, yet cannot be added across two people without smuggling in a common unit that does not exist. Utility is the thing the whole apparatus is built to track, and the one thing no instrument has ever read. And capital — the most solid-seeming quantity of all — turned out, under a decade of argument between two Cambridges, to be perhaps no single quantity at all.
So this is a science of measurement meeting the four things it cannot quite measure. The numéraire these volumes are after is not another figure to add to the accounts but an honest reckoning of how much of the counting is convention, inference, and faith — and exactly where each of the four stops being a measurement and starts being a decision.