A Price Is Just the Price

This issue argues that a price is not a fact about a thing but the tem­po­rary output of a system. It is an elegant idea. It is also, from the point of view of anybody who works in a market, a descrip­tion of Tuesday.

Practitioners do not believe that price is a prop­erty of an object. They never did. A trader is taught on the first day that there is a bid and an ask and that the last trade is history. A risk manager knows the dif­fer­ence between a mark and a close, and why an exchange's set­tle­ment price is not its last print. An accoun­tant has a whole stan­dard, with three levels, for how much judge­ment went into a fair value. A fund admin­is­tra­tor can tell you to the minute which bench­mark fixing her NAV used. None of this is hidden. It is written down, in con­tract spec­i­fi­ca­tions, method­ol­ogy doc­u­ments and rule­books, and it is read every day by the people whose job is to read it.

What this issue calls a mystery, the indus­try calls def­i­ni­tions. The word price, on its own, is infor­mal. In any con­tract that matters it is replaced by a precise term that says which price, from where, at what time. When a futures con­tract settles at the set­tle­ment price deter­mined by the exchange under rule so-and-so, nobody involved is con­fused about the nature of reality. They know exactly what number they agreed to.

There is a cost to dress­ing ordi­nary engi­neer­ing as phi­los­o­phy. A reader who comes away believ­ing that prices are fun­da­men­tally arbi­trary, con­structed, or unknow­able has learned some­thing false. The five venues quoting bitcoin in this issue's frozen second dis­agreed by nine basis points, and most of that turned out to be a cur­rency con­ver­sion. That is not evi­dence that price is a fiction. It is evi­dence of how extraor­di­nar­ily well markets agree, across con­ti­nents, in under a second, without anybody coor­di­nat­ing them.

The same goes for the famous fail­ures. LIBOR was cor­rupted because it was a survey dressed as a rate, and the fix was to base rates on trans­ac­tions. Oil went neg­a­tive because a phys­i­cally deliv­ered con­tract met a phys­i­cal con­straint, which is exactly what the con­tract said could happen. The nickel can­cel­la­tion hap­pened because an exchange's rule­book gave it that power, and a court later con­firmed the rule­book meant what it said. In each case the system did what its def­i­ni­tions spec­i­fied. The lesson is to read the def­i­ni­tions, not to doubt the concept.

Most people, most of the time, do not need to know how the price on their screen was made, for the same reason they do not need to know how their tap water was treated. The system works because spe­cial­ists main­tain it and because fail­ures are rare and loud. Telling readers that every number hides a hidden machine risks the oppo­site of what this mag­a­zine wants: not lit­er­acy, but a vague and fash­ion­able sus­pi­cion of every figure, which is easy to feel and useless to act on.

It is also worth notic­ing how little of the con­fu­sion in markets comes from the nature of price and how much comes from people not reading what they signed. The investor who bought an oil fund in April 2020 without knowing it held front-month futures, the bor­rower who did not know their loan ref­er­enced LIBOR, the trader who did not know an exchange could void trades: each was failed by a gap in their own knowl­edge of a doc­u­mented rule, not by a hidden meta­physics of value. The remedy is plain dis­clo­sure and plain reading.

A price is just the price. It is defined, it is pub­lished, and in the over­whelm­ing major­ity of cases it is exactly what it says it is.