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Public Debt and Low Interest Rates.
Further thoughts
Washington, March 5, 2019
Olivier Blanchard
Peterson Institute for International Economics | 1750 Massachusetts Ave., NW | Washington, DC 20036
3/5/2019 1
The Basic Argument
Two standard economic arguments against public debt
Fiscal costs : Higher (distortionary) taxes
Welfare costs: Crowding out of capital, less consumption
My analysis questions both:
• Fiscal costs? Forecasts: r<g for most advanced countries
by 1 to 2% over next 10 years. US, UK, Euro, Japan
No need to raise taxes in response to higher debt
• Welfare costs? Crowding out of capital. How costly?
Safe rate: risk-adjusted rate of return on capital
If low, signal that crowding out not very costly.
Conclusion. Public debt not desirable, but not catastrophic.
Public debt levels still matter
• As D/Y increases, r will increase. Eventually r>g
For two reasons:
Crowding out of capital, increase in rate of return on capital
Increased supply of safe assets: lower safety premium
At what level of debt does r>g?
Difficult to assess, but probably high. Japanese numbers
• If, for other reasons, r becomes larger than g:
Need to increase taxes: Depends on (r-g) times D/Y
So higher D/Y, higher fiscal cost.
More relevant, the larger the distribution of (r-g) in the future
US versus Italy.
• But no such thing as a common magic number for D/Y: 60%, 90% etc.
Implications for fiscal policy today
• US: Current primary deficits unjustified on purely fiscal grounds.
Not enough monetary policy room today to eliminate them fully
1% lower deficit, multiplier of 1.5, requires 150 bp lower rate.
Keep the same for now, but change the composition of expenditures?
Filling potholes. Fighting global warming.
Leaving a livable planet with higher debt: A good deal
• Europe. Slump, higher probability of recession
Nearly no monetary policy room. Negative rates
Need to be ready to use fiscal policy aggressively
Large benefits, little or no cost (case where r<<gbar).

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blanchard20190305ppt.pdf

  • 1. Public Debt and Low Interest Rates. Further thoughts Washington, March 5, 2019 Olivier Blanchard Peterson Institute for International Economics | 1750 Massachusetts Ave., NW | Washington, DC 20036 3/5/2019 1
  • 2. The Basic Argument Two standard economic arguments against public debt Fiscal costs : Higher (distortionary) taxes Welfare costs: Crowding out of capital, less consumption My analysis questions both: • Fiscal costs? Forecasts: r<g for most advanced countries by 1 to 2% over next 10 years. US, UK, Euro, Japan No need to raise taxes in response to higher debt • Welfare costs? Crowding out of capital. How costly? Safe rate: risk-adjusted rate of return on capital If low, signal that crowding out not very costly. Conclusion. Public debt not desirable, but not catastrophic.
  • 3. Public debt levels still matter • As D/Y increases, r will increase. Eventually r>g For two reasons: Crowding out of capital, increase in rate of return on capital Increased supply of safe assets: lower safety premium At what level of debt does r>g? Difficult to assess, but probably high. Japanese numbers • If, for other reasons, r becomes larger than g: Need to increase taxes: Depends on (r-g) times D/Y So higher D/Y, higher fiscal cost. More relevant, the larger the distribution of (r-g) in the future US versus Italy. • But no such thing as a common magic number for D/Y: 60%, 90% etc.
  • 4. Implications for fiscal policy today • US: Current primary deficits unjustified on purely fiscal grounds. Not enough monetary policy room today to eliminate them fully 1% lower deficit, multiplier of 1.5, requires 150 bp lower rate. Keep the same for now, but change the composition of expenditures? Filling potholes. Fighting global warming. Leaving a livable planet with higher debt: A good deal • Europe. Slump, higher probability of recession Nearly no monetary policy room. Negative rates Need to be ready to use fiscal policy aggressively Large benefits, little or no cost (case where r<<gbar).