The Monetarist Autopsy

In 1963 two economists published a nine-hundred-page brick that changed how the world understood the Great Depression. Milton Friedman and Anna Schwartz went through a century of American monetary data, month by month, and found that between 1929 and 1933 the money supply had shrunk by roughly a third. Not because the market demanded it. Because the Federal Reserve, the institution built to prevent exactly this, sat on its hands while a third of the money evaporated in bank failures. The slump was a monetary catastrophe the central bank permitted, not the market punishing its sins. That finding is largely correct, and devastating to anyone who thinks the 1930s were the market cleansing itself.

Start with what monetarism got right, because it got a great deal right. Friedman and Schwartz's A Monetary History of the United States did not blame the Depression on greedy speculators or a glut of goods. They traced it to a specific, avoidable policy failure: the Fed let the money stock collapse and called it prudence. From this came Friedman's most famous line (inflation is always and everywhere a monetary phenomenon), a blunt refusal to let politicians blame rising prices on unions, oil sheikhs, or corporate greed. It sounds obvious now. It was heresy in a profession convinced inflation came from wage-cost spirals and animal spirits. Monetarism dragged money back to the centre of the picture, where it belongs.

The second achievement was humility about what policy can do. Orthodoxy held that clever officials could fine-tune the economy, dialling demand up in a slump, down in a boom, like a thermostat. Friedman showed the thermostat has long and variable lags: by the time you feel the cold and turn the dial, the room has already changed, and your correction arrives to overheat it. His answer was a rule, not a genius. The k-percent rule said the money supply should grow at a slow, fixed rate every year, with the central bank forbidden from improvising. Pair that with his defence of floating exchange rates and open markets, and you have a principled case that discretion is the disease and constraint the cure. On that, an Austrian nods along.

Now the autopsy. The first cut is the deepest: monetarism treats the money supply as one homogeneous quantity you can steer, and it is not. New money enters at a particular door (the bond desk, the favoured bank, the state) and reshapes relative prices as it spreads outward. Richard Cantillon saw this in the 1700s: the first hands to touch new money spend it at old prices; the last hands get it after prices have already risen. So the same aggregate expansion produces different distortions depending on where it enters, and which capital projects it inflates first. Friedman conceded he set this aside for tractability. But it is no detail: the distortion of the capital structure is the whole disease, and the aggregate hides it.

The rest follows. The demand for money is not stable enough to target: in the 1980s central banks did what Friedman told them, watched velocity lurch unpredictably, saw the aggregates come unmoored from prices and output, and quietly abandoned the doctrine. Monetarism died as an operating manual on the desks of the people running it. Deeper still, rules-over-discretion was right in spirit but Friedman kept the monopoly: a central bank obeying a fixed rule is still a single planner setting the most important price in the economy. And his method (assumptions don't matter, only predictions) is the exact inverse of Austrian praxeology, and it is what licenses the aggregate-worship that blinds you to the Cantillon effect in the first place. Grant the diagnosis; reject the cure.