Interest rates are not going back to zero. The zero-interest-rate policy that prevailed from 2008 to 2022 was not the historical norm. It was an emergency intervention — the monetary equivalent of a medically induced coma — deployed to prevent the financial system from collapsing after the worst crisis since the Great Depression and then extended through a global pandemic. The Federal Reserve's target rate of 0 to 0.25 percent for the better part of fourteen years created a generation of borrowers, investors, and homebuyers who internalized a 3 percent mortgage and a 0 percent savings yield as the natural state of affairs. It was not. The natural state of affairs is determined by a variable called R-star — the neutral rate of interest — and R-star has moved permanently higher.
What R-Star Is
R-star (written as r* in economic notation) is the theoretical real interest rate at which the economy operates at full employment with stable inflation. It is "neutral" in the sense that it neither stimulates nor restricts economic activity. When the Federal Reserve sets the federal funds rate above r-star, monetary policy is restrictive — borrowing is expensive enough to slow the economy and reduce inflation. When the Fed sets the rate below r-star, policy is accommodative — borrowing is cheap enough to stimulate spending and investment.
R-star is not directly observable. It is estimated through statistical models that infer the neutral rate from the behavior of output, inflation, and interest rates over time. The most widely cited estimate is produced by the Federal Reserve Bank of New York using the Holston-Laubach-Williams model. That model placed r-star at approximately 0.5 percent in real terms during the 2010s — meaning the nominal neutral fed funds rate was approximately 2.5 percent (r-star plus the 2 percent inflation target). A fed funds rate of 2.5 percent translates to a 30-year fixed mortgage rate of approximately 4.5 to 5.0 percent, depending on credit spreads and the term premium.
The model's current estimate places r-star at approximately 1.0 to 1.5 percent in real terms — a level that implies a nominal neutral fed funds rate of 3.0 to 3.5 percent and a corresponding mortgage rate of 5.5 to 6.5 percent. The shift from 0.5 to 1.0-1.5 percent does not sound dramatic in percentage-point terms. In mortgage-payment terms, it means the difference between a $2,100 monthly payment on a $400,000 loan at 4.5 percent and a $2,500 payment at 6.0 percent — a $400-per-month increase that prices millions of households out of homeownership at current valuations.
Why R-Star Has Risen
Three structural forces have pushed the neutral rate higher than the level that prevailed during the post-crisis decade. None of them is cyclical. None of them will reverse with the next Fed meeting or the next election.
The first is fiscal expansion. The federal government is running budget deficits exceeding 6 percent of GDP — a level historically associated with wartime or recession, neither of which applies to the current economic environment. Persistent deficits absorb private savings that would otherwise flow into the bond market, reducing the supply of lendable funds and pushing equilibrium interest rates higher. The Congressional Budget Office projects that federal debt held by the public will exceed 120 percent of GDP by 2035 — a trajectory that sustains upward pressure on r-star for as long as the deficits persist.
The second is deglobalization. The four decades of declining interest rates from 1982 to 2020 coincided with the integration of China, Eastern Europe, and Southeast Asia into the global economy — a "global savings glut" that flooded the world with capital seeking safe, dollar-denominated assets. That capital compressed yields on U.S. Treasuries and, by extension, on every interest rate benchmarked to Treasuries. The reversal of globalization — driven by trade wars, supply chain reshoring, and geopolitical fragmentation — is reducing the flow of foreign savings into dollar assets, removing the disinflationary and rate-suppressing force that defined the prior era.
The third is demographic transition. The retirement of the baby boom generation is converting savers into spenders — drawing down accumulated capital rather than adding to it. An aging population consumes more (healthcare, housing, services) and produces less (labor force participation declines), shifting the balance between savings and investment in a direction that raises the equilibrium interest rate.
What This Means for Borrowers
The homebuyer waiting for mortgage rates to return to 3 percent is waiting for a structural environment that no longer exists. A 3 percent 30-year fixed mortgage rate requires a federal funds rate near zero, which requires an economy in crisis — the 2008 financial collapse or the 2020 pandemic. Absent a comparable catastrophe, the floor for mortgage rates is approximately 5 to 5.5 percent, and the likely range for the next decade is 5.5 to 7.0 percent.
This does not mean homeownership is unaffordable. It means homeownership is priced at the historical norm rather than at the emergency-intervention anomaly. The average 30-year fixed mortgage rate from 1971 to 2000 was approximately 9.5 percent. From 2000 to 2008, it averaged 6.2 percent. The sub-4 percent rates of 2012-2021 were the exception, not the rule. The economy in which today's first-time buyers are operating is not broken. It is normalized.
What This Means for Investors
The return to a positive r-star restructures the investment landscape in ways that benefit savers and penalize borrowers. Savings accounts, certificates of deposit, and money market funds now offer yields of 4 to 5 percent — compensation for holding cash that was unavailable for fourteen years. High-yield savings accounts have become a legitimate asset class rather than a parking lot for emergency reserves.
Bond investors, who suffered the worst returns in recorded history during the 2022 rate-hiking cycle, now hold instruments with meaningful yield cushions — 5 percent on investment-grade corporate bonds, 4 percent on Treasuries, 3.5 to 4.5 percent on municipal bonds. The "TINA" thesis ("There Is No Alternative" to stocks) that drove equity valuations during the zero-rate era is no longer operative. There are alternatives. They yield 4 to 5 percent with minimal credit risk.
Equity valuations must adjust to a world where the risk-free rate is 3.5 to 4.5 percent rather than 0 to 1 percent. The discounted cash flow models that value stocks by discounting future earnings at a rate derived from the risk-free rate produce lower present values when that rate is higher. The adjustment has already begun — the S&P 500's forward price-to-earnings ratio compressed from 23 times in late 2021 to 18 times by late 2023 — but the process is ongoing and may not be complete.
The Bottom Line
R-star is not a forecast. It is a structural equilibrium — the rate at which the economy balances savings, investment, fiscal deficits, and demographic forces. The forces that suppressed r-star for fourteen years (post-crisis deleveraging, globalization, prime-age labor force growth) have reversed. The forces that are elevating r-star (fiscal deficits, deglobalization, demographic aging) are durable. The investor, the homebuyer, and the policymaker who plans for a return to zero is planning for a world that will not arrive. The investor who plans for a neutral rate of 3 to 3.5 percent is planning for the world that exists.