Scott Sumner on Monetary Rules, Blooming Late, and the Death of Cinema

Monetary economist Scott Sumner, originator of Market Monetarism and NGDP-level targeting, defends his view that nominal GDP shocks, not credit-market breakdowns, drive the business cycle — ranging from Depression-era newspapers and China’s tolerated deflation through his ‘never reason from a price change’ maxim to a long closing stretch on Hitchcock, Ozu, and why he was a deliberate late bloomer.

Key ideas

1. Nominal GDP shocks, not credit-market breakdowns, are the primary driver of the business cycle. Sumner reads 1929, Argentina’s early-2000s crisis, and 2008 as cases where a monetary-policy mistake caused nominal GDP to collapse, and financial distress followed as fixed nominal debts became harder to service — a ‘cold turning into pneumonia’ rather than an autonomous credit shock. Cowen presses this as close to tautological given how tightly real and nominal GDP move together under sticky wages, and argues credit shocks carry independent causal force.
2. Monetary policy should be judged as more or less rule-like, not by a rules-versus-discretion binary. Sumner rejects the idea that a central bank must choose between a strict formula and unfettered judgement; US inflation holding near 2 percent for three decades shows policy becoming steadily more rule-like without ever being fully automatic, a framing he applies throughout to defend Market Monetarism against the objection that discretion can never truly be removed.
3. China’s and Japan’s tolerated deflation is a self-inflicted consequence of prioritising the exchange rate over macroeconomic stability. Hong Kong’s 40-year dollar peg, whose business cycle tracks US dollar strength almost exactly, is Sumner’s clearest illustration; he also recalls US Treasury pressure on Japan in the early 2000s not to devalue the yen, even as American economists urged devaluation to escape the liquidity trap.
4. ‘Never reason from a price change’ generalises far beyond its origin. Traced back to a 1989 paper on real-wage cyclicality, decades before Sumner coined the phrase, the maxim holds that no price movement — an interest rate, an exchange rate, an inflation reading — carries fixed meaning on its own; the same movement implies opposite things depending on whether a demand or supply shock drives it.
5. A deliberate late bloomer, Sumner did nearly all his substantive research after being denied tenure. Rejected for insufficient publications at Bentley, he quickly produced several papers to win tenure on reapplication, then wrote the bulk of his Great Depression scholarship — the one book he considers a genuine academic contribution — afterward, before finding his largest audience in his 50s through blogging.

Content

Reading the Depression in real time

Sumner spent years reading contemporaneous New York Times coverage of the 1920s and 1930s rather than retrospective history, and found it striking how little contemporaries grasped in real time — experts confidently predicted Hitler would moderate his views as he neared power, a forecast events soon demolished. The same real-time distortion shaped how Americans read Franklin Roosevelt’s abrogation of the gold clause: conservative financial opinion in New York regarded it as an abuse of power, but the broader public, exhausted by four bleak years under Hoover, largely welcomed Roosevelt’s ‘bold and persistent experimentation’. Sumner extends the lesson to fiat currency’s slow acceptance more generally: the trauma of post-World War I hyperinflation, especially in Germany, discredited fiat money so thoroughly that even Keynes preferred an adjustable gold peg to a pure fiat regime, and countries clung to gold until the pain of the Depression finally forced their hand.

On NGDP targeting and the limits of monetary rules

Asked whether Carl Schmitt’s dictum — ‘the sovereign is he who decides the exception’ — rules out any true monetary rule, Sumner reframes the whole rules-versus-discretion debate as a matter of degree rather than kind. US inflation averaging near 2 percent for roughly 30 years, compared with wide swings from near-zero to double digits in the prior 30, shows policy becoming more rule-like even without ever becoming a perfectly automatic formula. Cowen offers an alternative reading: that the Fed’s discretion partly exists to head off a Congress prone to worse interventions, and that its aggressive 2020–21 stance may reflect exactly that dynamic. Sumner disagrees for the US case specifically — he attributes the Fed’s post-pandemic overshoot to a genuine, if mistaken, belief that a decade of below-target inflation after 2008 demanded aggressive ‘makeup’ policy, not pressure from Congress, which he doubts was going to scale back fiscal stimulus regardless of where the Fed set rates. He does concede politics shapes Fed behaviour more visibly in areas like bank regulation than in core stabilisation policy.

The 2008 crisis reread through nominal GDP

Sumner’s account of 2008 inverts the standard credit-crisis narrative. Responding to Brad DeLong’s suggestion that NGDP-level targeting implies bailing out firms like General Motors, Sumner argues the opposite: stabilise the path of nominal GDP and most other structural problems become manageable case by case, without requiring systemic bailouts. His causal story, applied consistently across 1929, Argentina in the early 2000s, and 2008, runs from monetary-policy error to falling nominal GDP to financial distress — because the overwhelming majority of financial contracts are fixed in nominal terms, a sharp fall in nominal income makes debts harder to service across the economy at once, an effect he likens to a cold turning into pneumonia. Europe’s deeper, longer 2008–09 recession, followed by a second dip after the European Central Bank raised rates twice into weak nominal growth in 2011, serves as his cross-country control: despite the US originating the subprime shock, tighter European monetary policy produced the worse outcome, which Sumner reads as evidence that monetary stance — not the initiating credit shock — set each region’s depth of recession.

Cowen pushes back hard on the underlying logic, arguing it risks near-tautology: because real and nominal GDP move together so tightly in an economy with sticky wages, attributing the fall in real output to the fall in nominal output can look like explaining a thing by itself, and Cowen states his own view that credit-market shocks carry real, independent force that a purely nominal framework understates. Sumner’s rebuttal points to cases like the simultaneous 2008–09 Zimbabwean recession and hyperinflation, where nominal and real variables moved in opposite directions — evidence, he argues, that the tight US correlation is a genuine empirical finding about how the American economy responds to nominal shocks, not a definitional artefact.

China, Japan, and the exchange-rate trap

Sumner treats China’s persistent deflation — echoing its own late-1990s/early-2000s episode — as a direct consequence of prioritising a strong exchange rate over domestic macroeconomic stability, the same mechanism visible in miniature in Hong Kong’s 40-year dollar peg, whose business cycle tracks US dollar strength almost exactly. He recalls that in the early 2000s, even as American economists urged Japan to devalue the yen to escape its liquidity trap, US Treasury officials were privately pressuring Japan not to, under an implicit threat of protectionist retaliation — a possible template, he speculates, for China’s own current reluctance. Abe’s 2012 campaign on a platform of higher inflation, and Japan’s subsequent improvement, is Sumner’s strongest evidence that apparently structural deflationary stagnation is often a correctable policy failure rather than a deep demographic or banking-sector problem; he argues monetary policy is unusually prone to genuine, non-political mistakes compared with areas like tariff policy, which he attributes more readily to special-interest capture.

‘Never reason from a price change’

Asked about what a listener called his single best contribution to economic thinking, Sumner traces the idea’s true origin to a 1989 Journal of Political Economy paper he co-wrote with Steve Silver on real-wage cyclicality — a critique of prior literature for reasoning directly from price-level movements — roughly two decades before he coined the now-famous phrase itself, initially in his Bentley classroom and then on his blog. The generalised rule extends well beyond individual prices: never infer the meaning of an interest-rate move, an exchange-rate move, or an inflation reading from the direction of the move alone, since the same movement implies opposite economic conditions depending on what is driving it — the liquidity effect versus the Fisher effect for interest rates, demand-side versus supply-side causes for inflation. Sumner names confusion between low interest rates and ‘easy money’ as the fallacy’s most persistent modern case, visible in the ongoing dispute between Keynesians and Neo-Fisherians over whether low rates signal loose or tight policy.

Cinema as a visual art form

The conversation’s long final stretch treats Sumner as a serious film critic in his own right. He reads cinema primarily through its visual language — cinematography and a director’s visual signature — which he offers as the reason cinephiles tend to prefer film to television, where screenplay dominates. He and Cowen agree that Hitchcock’s Vertigo is his most personal and ‘deepest’ film, set against lighter entertainments like North by Northwest, and Sumner names the late-1990s Taiwanese New Wave as the film movement that hit him the way the French New Wave hit an earlier generation — a connection he doubts he will feel again with newer films, even from directors he judges equally talented. Invoking Susan Sontag’s question of whether masterpieces have simply stopped being made or audiences have stopped being receptive to them, Sumner points to precedents like the concentrated burst of Dutch Golden Age painting between 1600 and 1675, or Coppola’s four-film run in the 1970s followed by comparative silence, as evidence that artistic golden eras cluster and then dissipate — while crediting deliberately cultivated patience with letting him now appreciate ‘quiet’ directors like Ozu that would have bored him as a young man.

A deliberate late bloomer

Sumner chose the University of Chicago’s economics PhD for its free-market orientation and its emphasis on price-theoretic intuition over the more mathematical training then associated with MIT, and studied under Robert Lucas despite writing his dissertation on currency hoarding — an unusual pairing given Lucas’s own rational-expectations focus. He was denied tenure at Bentley College for insufficient publications, quickly produced several papers (including the 1989 JPE piece) to win tenure on reapplication, and then did the great majority of his research — including the Great Depression scholarship he considers his one substantial academic contribution — only after receiving tenure. He attributes his unconventional trajectory to personality rather than external obstruction, and did not find his largest audience until his 50s and 60s, through blogging that began around 2009.

See also

• Scott Sumner — speaker
• Tyler Cowen — host
• Market Monetarism — the school of thought Sumner originated, discussed at length throughout
• Monetarism — the earlier Friedman/Schwartz school Market Monetarism revises