S6 Ep26: Blanchard: What caused US inflation?

Episode Summary

Executive Summary: Olivier Blanchard argues that the U.S. COVID-era inflation burst was driven mainly by excessive fiscal stimulus plus large price shocks (energy, cars, shortages), not primarily by wage inflation or a standard Phillips-curve wage spiral. He says the Fed was late but broadly right once it reacted, and expects disinflation to continue slowly, with some unemployment increase likely.

Main Topics: What caused the inflation burst (Priority: 5/5): Blanchard says the main error was fiscal overexpansion in 2020-21, with demand too strong for the economy to absorb. He sees large relative-price shocks as the proximate trigger of the inflation surge. Phillips curve debate and labor-market overheating (Priority: 5/5): He contrasts the mainstream view that the Phillips curve had flattened with the minority view that low unemployment would still generate inflation. He says the wage channel was less important than expected, though labor-market overheating still mattered. Why price spikes mattered more than wage acceleration (Priority: 5/5): Used cars, energy, and shortage-related price spikes dominated quarter-to-quarter inflation dynamics. These shocks were large but transitory, unlike the 1970s pattern where they fed into wages and expectations. Method and contribution of the Bernanke-Blanchard paper (Priority: 4/5): The paper uses a deliberately simple model to decompose inflation drivers in a policymaker-friendly way, aiming to explain the data more transparently than highly technical microfounded models. Assessment of the Fed’s response (Priority: 4/5): Blanchard says the Fed should have tightened earlier, but once it began reacting, its policy path was broadly appropriate given lags, uncertainty, and financial-stability tradeoffs. Future inflation path and policy tradeoff (Priority: 4/5): He expects continued gradual disinflation, likely requiring some rise in unemployment. He also raises the possibility that a 3% inflation target could be preferable, though credibility concerns make that debate politically difficult. Implications for Europe and the UK (Priority: 3/5): Blanchard believes the U.S. story may generalize, but the key difference abroad is the degree of overheating. He suggests the UK may have stronger shortage effects, possibly linked to Brexit, while the euro area’s labor-market tightness is less clear.

Key Arguments: The biggest policy mistake was excessive fiscal stimulus from both the Trump and Biden administrations, which generated too much demand. Monetary policy was late to respond, but that delay likely changed the path only modestly compared with the size of fiscal excess. The mainstream 2021 view that the Phillips curve was too flat to produce much inflation was wrong because it relied on estimates from the unusually calm Great Moderation period. Inflation came less from wage explosions than from large relative-price shocks in energy, food, used cars, and shortages. Unlike the 1970s, these shocks did not trigger strong wage catch-up, indexing, or expectation de-anchoring, showing central-bank credibility remained intact. As the supply shocks fade, the remaining inflation is more clearly labor-market driven, making disinflation slower and costlier in unemployment terms. The Fed’s job is to navigate gradually: tightening still has effects with a lag, and pushing too hard could create unnecessary financial stress. A lower inflation target is not impossible in principle; Blanchard suggests 3% may be a sensible steady-state target, though central banks are unlikely to adopt it soon. The U.S. case may not perfectly map onto Europe, but the same decomposition framework could reveal whether shortages, labor overheating, or both dominate elsewhere.

Data Points: Inflation onset: 2021-2022 - Period when U.S. inflation took off after COVID-era policy responses and supply disruptions. Policy lag mentioned: ~1 year late - Blanchard says the Fed should have moved roughly a year earlier, and earlier still should have warned administrations the fiscal plans were too large. Estimated mainstream economist view: ~95% - He says about 95% of relevant economists believed the Phillips curve was flat enough that stimulus would not create much inflation. Inflation target discussed: 3% - Blanchard argues that, absent historical credibility concerns, 3% could be a better long-run target than 2%. Current inflation goal: 2% - Referenced as the existing central-bank target that the U.S. and others are trying to return to. Time horizon mentioned for possible return to target: end of 2024 or 2025 - He says central banks may choose a slower path and reach lower inflation by late 2024 or 2025 if expectations remain anchored. Labor-market indicator: Vacancy-unemployment ratio - Blanchard says this ratio would need to fall a lot to get inflation back to 2%. Policy tools referenced: QE and negative rates - He notes central banks already used unconventional tools without losing credibility, showing a 3% target might have been feasible earlier.

Pivotal Quotes: "There's absolutely no question that the various spending programs, both from the Trump administration in 2020 and the Biden administration in 2021, were too large." — Olivier Blanchard: Explaining his view that excessive fiscal stimulus was the original cause of the inflation burst. "We thought that there would be this enormous wage pressure. And there was not a whole lot of wage pressure." — Olivier Blanchard: Clarifying that inflation was driven more by prices and shortages than by the wage channel he and others initially expected. "The credibility of central bank has remained very strong." — Olivier Blanchard: Explaining why the 2020s inflation episode did not turn into a 1970s-style wage-price spiral.

Implications: Listeners should expect disinflation to continue, but not painlessly: lower inflation likely requires some unemployment rise. For policymakers, the episode argues for earlier fiscal caution, gradual tightening, and continued attention to shortages and labor-market slack.