Irving Fisher: The Economist Who Lost His Fortune in 1929

On the evening of 15 October 1929, at a monthly dinner of the Purchasing Agents Association in New York, Irving Fisher spoke the sentence that would outlive every equation he ever wrote. Stock prices, he told the room, had reached what looked like a permanently high plateau. The New York Times printed it the next morning. Two weeks later the Dow Jones Industrial Average closed Black Tuesday at 230.07, and by 13 November it stood at 198.60 — a little over half its September level.

Fisher had somewhere near ten million dollars in the market, most of it borrowed against the shares of a single office-equipment company. He lost all of it, and then rather more than all of it. Yale University eventually bought his house on Prospect Street and leased it back to him so that its most famous professor would not be evicted in public (Allen, 1993).

What lifts the episode above a footnote about hubris is what he did next. Over the four years that followed, broke and discredited, Fisher wrote the clearest short account anybody has produced of why an economy keeps sinking after a borrowed boom ends — a mechanism that central bankers rediscovered in 2008 and have argued about ever since.

A Machine Made of Water

Irving Fisher was born on 27 February 1867 in Saugerties, New York, the son of a Congregational minister who died of tuberculosis in the same week his son was admitted to Yale. Family money did not exist; Fisher tutored, won prizes, and graduated first in the class of 1888. Three years later he took Yale's first doctorate in economics, supervised jointly by William Graham Sumner, the sociologist, and Josiah Willard Gibbs, the thermodynamicist who had worked out the phase rule.

That pairing decided everything afterwards. Fisher treated an economy the way Gibbs treated a vessel of gas: as a system of interdependent quantities that must come to rest at a determinate point, and whose behaviour could therefore be written down.

His dissertation, Mathematical Investigations in the Theory of Value and Prices, derived a general equilibrium of exchange without having read Léon Walras, whose work he discovered only as the manuscript was being finished. To make the argument visible to readers who could not follow the algebra, Fisher built the thing. His apparatus was a cistern of water holding a set of floating tanks connected by levers, pivots and linked rods, each tank standing for a consumer or a commodity. Tilt one lever and water moved through every chamber until the whole contraption settled into a new configuration of levels — the new price vector. He rebuilt it in 1925 when the original wore out, and used it to teach undergraduates for decades.

Appreciation and Interest

In 1896, in a monograph of just over a hundred pages, Fisher separated the interest rate a contract specifies from the interest rate a lender actually earns. Where prices rise, the borrower repays in cheaper dollars; where prices fall, the debt grows heavier in real terms even though its face value never changes. The relation now taught as the Fisher equation — nominal interest approximately equals the real rate plus expected inflation — dates from that essay, and it is the seed of everything he wrote about depressions thirty-seven years later.

Then came a decade of illness. Fisher contracted tuberculosis in 1898, the disease that had killed his father, and spent three years in sanatoria in Colorado Springs and Saranac Lake. He came back in 1901 with a convert's zeal for public health that never left him. His manual How to Live, written with Eugene Lyman Fisk in 1915, went through more than twenty editions and sold several hundred thousand copies, making its author better known to the general American public as a diet reformer than as a theorist of capital.

The Purchasing Power of Money set out the equation of exchange in the form students still meet, and used it to argue for a currency whose gold content would be adjusted whenever an index number showed the price level drifting — the compensated dollar. Nobody adopted it. To make the index he needed, Fisher founded the Index Number Institute in 1923 and sold weekly price indices to newspapers, reaching several million readers. The Making of Index Numbers laid down formal tests an index should satisfy and produced the geometric mean of the Laspeyres and Paasche measures that statistical agencies still call the Fisher ideal index.

He also stumbled on a relationship that would be named for somebody else. In a 1926 article in the International Labour Review, Fisher fitted changes in the price level against unemployment and found a clear inverse association, concluding that price movements led employment rather than the reverse. The Journal of Political Economy reprinted the paper in 1973 under a title supplied by the editors: I Discovered the Phillips Curve.

The Plateau

By the late 1920s Fisher was rich, which was unusual for an academic and mattered greatly to what followed. He had patented a visible card-index system in 1913, built a company around it, and merged it into Kardex Rand in 1925; the combination became Remington Rand in 1927. His payment was stock, and he borrowed against that stock to buy more stock.

His public optimism rested on an argument, not on cheerleading. Fisher believed the 1920s had produced a genuine break in the trend of corporate earnings — scientific management, electrification, the research laboratory, the merger wave, and a Prohibition-era workforce he considered more productive. Against those earnings, he argued, share prices were not extravagant. He said so repeatedly through 1929, and after the break he wrote The Stock Market Crash — and After, published in 1930, which held that the decline had been a shakeout of speculative excess and that the market's level would soon be recognised as too low.

Fisher's error was not the forecast alone. Margin debt of a size that would have passed unnoticed for a man of his wealth in a rising market became fatal in a falling one. Remington Rand shares fell from the high fifties to about a dollar over the next three years, and every loan secured against them was called. His sister-in-law lent him money. Yale bought the house. He spent the rest of his life owing the Internal Revenue Service and his relatives, and he died still owing them.

The Nine Links

Being ruined by a mechanism is a peculiar qualification for describing it, and Fisher used it. Booms and Depressions appeared in 1932, and the compressed version — twenty-one pages in the fourth issue of Econometrica, a journal he had helped found — appeared in October 1933 as The Debt-Deflation Theory of Great Depressions.

His claim was that two conditions, and not the long list of candidates economists were then offering, do the work: "over-indebtedness to start with, deflation following soon after." Over-investment and over-speculation, he wrote, "would have far less serious results were they not conducted with borrowed money." Once both are present, liquidation becomes self-defeating. Debtors sell assets to pay down debt; the selling depresses prices; bank deposits contract as loans are repaid and not renewed; the price level falls; and each surviving dollar of debt swells in real terms faster than repayment shrinks the principal. Fisher's summary of that is the most quoted line he ever wrote: "the more the debtors pay, the more they owe."

The order matters less than the feedback. Every link tightens the one before it, so that the attempt to become less indebted leaves the debtor more indebted — what Fisher called the paradox of a stampede to liquidate. He drew an explicit contrast with the sharp, self-correcting slump of a decade earlier, when prices fell hard and recovery came quickly because household and corporate balance sheets were not loaded with debt of the kind the 1920s had built. The pattern of the deflation America let run in 1920 and 1921 was not the pattern of 1931, and Fisher was among the first to explain why the two looked superficially alike and behaved nothing alike.

A fall of roughly a quarter in the general price level between 1929 and 1933 is what the mechanism runs on. A farmer who borrowed in 1928 against land priced at 1928 dollars was repaying, in 1932, with dollars a third more valuable and crops that fetched far less. No default was necessary for the burden to grow.

Why Nobody Listened

Publication could hardly have been worse timed. Keynes's General Theory arrived in 1936 and absorbed the profession's attention; its apparatus of effective demand, liquidity preference and the multiplier explained the same catastrophe without requiring anyone to trace balance sheets. Fisher's paper, meanwhile, carried the signature of a man who had told the country to buy in October 1929, and that memory did his argument no favours. Econometrica was three issues old. Debt-deflation dropped out of the literature for a generation.

Its rehabilitation came in pieces. Friedman and Schwartz assembled the monetary history that documented Fisher's second link, showing the money stock contracting by about a third between 1929 and 1933 and attributing the collapse to Federal Reserve inaction — a reading that put the institution founded at the secret meeting on Jekyll Island in 1910 at the centre of the story (Friedman and Schwartz, 1963). James Tobin's essays on the Yale tradition restored Fisher's standing as a theorist and called him the greatest economist America had produced, a judgement Milton Friedman repeated in almost the same words from a very different position (Tobin, 1985).

Ben Bernanke's 1983 paper on the nonmonetary effects of the financial crisis supplied the microeconomic machinery Fisher lacked, showing how bank failures destroy information about borrowers and raise the cost of credit intermediation in ways no money-stock figure captures (Bernanke, 1983). Richard Koo's account of Japan after 1990 described corporations that kept paying down debt for a decade while interest rates sat at zero, because their objective had switched from maximising profit to minimising liabilities — Fisher's first link, running in slow motion through the deflation of the Japanese asset bubble, and the source of the phrase balance-sheet recession (Koo, 2008).

By the autumn of 2008 the 1933 paper was being circulated inside central banks. Bernanke was chairing the Federal Reserve. Whatever else can be said about the policy response to the collapse of the mortgage credit system, its designers were unusually clear that letting the price level fall while balance sheets were loaded with nominal debt would make the hole deeper.

The Last Fifteen Years

Fisher spent them campaigning. He pressed Franklin Roosevelt for reflation — raising the price level back to its pre-slump level and then stabilising it — and wrote letters to the White House with a persistence that eventually exhausted its patience. In 1935 he published 100% Money, arguing that demand deposits should be backed entirely by reserves so that banks could no longer create or destroy money by lending, a version of the Chicago Plan that surfaced again after 2008 in work at the International Monetary Fund. He promoted stamped scrip, the demurrage currency issued by a handful of American towns in 1932 and 1933 to force money to circulate.

He also spent years on causes that have not aged into respectability. Fisher was a Prohibition campaigner who published statistical defences of the Eighteenth Amendment, and he was the first president of the American Eugenics Society, founded in 1922. His biographers treat these as continuous with the rest of him rather than as aberrations — the same conviction that measurement plus good design could improve any system, applied to human beings (Dimand, 2019).

Irving Fisher died of colon cancer in New York on 29 April 1947, aged eighty, insolvent. The professional standing he had lost in 1929 was restored in full only after his death, and his 1933 paper is now on the reading list of every graduate course on financial crises. The market that ruined him has been analysed ever since in the vocabulary he invented while it was ruining him: real interest, money illusion, the ideal index, the debt-deflation spiral. He is quoted twice in most textbooks — once for a sentence about a plateau, delivered to purchasing agents over dinner, and once for the paper he wrote after that sentence cost him his house.