Two driving forces are now simultaneously pushing in the direction of higher long-term real interest rates. While investors and commentators often tend to conflate the two, I think it is useful instead to distinguish them clearly. They are rising investment, and persistently large fiscal deficits.
A new trend toward stronger investment has emerged and is likely to endure for the next several years, driven by a number of important priorities: (a) there is a need to make up for past under-investment in infrastructure, including traditional infrastructure as well as digital infrastructure. The American Society of Civil Engineers’ latest report assigns a failing grade to overall US infrastructure (not for the first time)1; (b) rising geopolitical tensions necessitate an increase in defense spending across Western countries; © growing interest in the potential of Artificial Intelligence calls for new investment in the necessary hardware (notably semiconductors), software and energy; (d) the green energy transition requires more investment to boost the role of renewables; and (e) manufacturing companies need to continue to invest in new technologies, which includes making supply chains more resilient.
Not all of this will result in rapid gains in productivity. For example, while the green energy transition is a very important goal, a lot of the required investment will not increase productivity growth in the short and medium run. Because it consists of replacing existing capital, it increases current economic growth via higher expenditures, but it does not raise productivity—much like rebuilding existing structures after they’ve been destroyed by a hurricane. The economist Jean Pisani-Ferry, in a recent report for the French government, has estimated that in fact investment in the green transition will likely reduce productivity growth by a quarter percentage point per year for the next several years. (The report also warns that the green transition increases inflation risks over the next decade)2.
However, the bulk of investment should over time result in faster productivity growth (the acceleration in US productivity during 2023 already gives hope, even if the weak first quarter of this year counsels caution). Faster productivity growth should in turn drive faster real economic growth, reversing one of the key arguments of the Secular Stagnation theory3, and implying a higher equilibrium interest rate in the long run.
Moreover, for a given level of savings, stronger investment also eliminates or reduces the “savings glut,” again pointing to higher real interest rates.
The government has and will carry out some of this, and investment is therefore often mentioned in the same breath as wider fiscal deficits. But the two need not go hand in hand. Governments could offset stronger public investment with a reduction in less productive public spending (or with higher taxes). Moreover, a significant portion of governments’ investment often turns out to be ineffective at raising productivity—the private sector has consistently been a much better allocator of capital.
The United States has experienced a persistent loosening of fiscal policy that goes well beyond the country’s public investment efforts. Therefore, quite separately from lifting investment, persistent large fiscal deficits now play their own important role in shaping the outlook for interest rates. The US government has been running a massively loose fiscal policy for a very long time now: The US fiscal deficit has averaged close to 8% of gross domestic product (GDP) for the last six years. It averaged just under 6% of GDP during 2022-2023 even as economic growth boomed, and the Congressional Budget Office (CBO) projects the deficit to average 5.5% of GDP for the next five years and then to rise further into the future. As a consequence of persistent large deficits, the debt stock has risen sharply. A decade ago, publicly held federal debt was about 70%; now it is close to 100% of GDP and will keep rising rapidly if deficits remain as large as the CBO forecasts.
The need to fund large fiscal deficits year after year means a lot of pressure on bond supply. For a given level of demand, this tends to push bond prices down and interest rates up. Moreover, a large fiscal deficit, growing debt and high interest rates create a vicious spiral that makes it harder and harder to reduce the deficit. Currently, non-defense discretionary expenditures account for less than one-sixth of the US budget (15% of total expenditures). Interest expenditures meanwhile keep rising—they averaged just 1.5 % of GDP in the last 10 years. The CBO projects that they will average 3.5 % of GDP for the next 10 years, more than double, and will grow larger than non-defense discretionary spending by 2025. This would leave very few resources for education, infrastructure investment, transportation, homeland security and the like.
And, the underlying CBO forecasts are probably conservative: They assume that the interest rate on federal debt will remain under 3.5% over the next decade. To put this assumption in perspective, consider that through the 1990s up to the eve of the global financial crisis (GFC)—in other words before the more recent period of ultra-loose monetary policy—the interest rate on US government debt averaged close to 6%. If the average interest rate on debt were to rise even just one percentage point above the CBO assumption (still well below the pre-GFC average), within 10 years interest expenditures would be more than double their current level.
Any way you cut it, bringing the US budget deficit under control will require very serious efforts, which in my view seems implausible in the current political climate. Meanwhile, loose fiscal policy will likely continue to put upward pressure on interest rates.
I have been arguing for some time that equilibrium real interest rates are likely much higher than the markets and the Federal Reserve (Fed) still seem to assume—with the neutral fed funds rate above 4% rather than at the Fed’s current forecast of about 2.5%, and 10-year US Treasury yields correspondingly higher. The confluence of loose fiscal policy and a rising investment trend can only strengthen my conviction in this higher interest rates outlook.
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1. Source: “2021 Report Card for America’s Infrastructure.” American Society of Civil Engineers, 2021.
2. Source: Pisani-Ferry, Jean and Mahfouz, Selma. “The economic implications of climate action.” Republique Francaise. November 2023. There is no assurance that any estimate, forecast or projection will be realized.
3. Secular Stagnation theory suggests that an economy can experience persistent low GDP growth, low interest rates, and high long-term unemployment due to a deficiency in aggregate demand.
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