“Will Joe Biden’s Fiscal Stimulus Overheat The American Economy?”

That’s the title of a new article in the Economist:

There are three main reasons to suspect overheating might be on the cards: emerging evidence that the downturn may prove temporary; generous stimulus; and the Federal Reserve’s monetary-policy strategy.

The article recounts the calculation of what is needed to fill the output gap and the possibility that the Biden package (see numbers here, from CRFB) over-fills.

One key question in my mind is — how large is the output gap? If we use the CBO’s most recently published estimate of potential GDP and the mean forecast of Wall Street economists, then the output gap shrinks to zero by 2021Q4.

Figure 1: GDP (bold black), WSJ January survey mean (red squares), CBO potential GDP as of January 2020 (light gray), as of July 2020 (dark gray), and pseudo-Delong-Summers (k=5) using actual data and CBO projections of GDP to 2030 (teal). Source: BEA, CBO (January 2020), CBO (July 2020), WSJ, and author’s calculations.

If on the other hand, potential GDP is closer to the level the CBO projected in January 2020 — so essentially assuming not a lot of the hits to investment actually occur — then the output gap is zero at end of 2023. The CBO revised downward its estimated potential on this basis (CBO, July 22, 2020, p.3):

CBO expects that the pandemic and resulting recession will significantly affect the level of
potential output over the next several years by reducing the level of investment. In the  agency’s assessment, recent developments will have little effect on workers’ long-term willingness to supply potential hours of work. By contrast, lower investment will leave potential output about 0.7 percent lower in 2023 and 2024 than it would have been if the pandemic and recession had not occurred. Through 2030, much of that shortfall in investment will be made up as businesses respond to growing demand for their products and services, but larger federal debt is projected to crowd out some private investment.

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