What this covers
Kenneth Rogoff and Tyler Cowen explore the architecture of America's long-term fiscal problem in this conversation, with Rogoff laying out why the conventional escape routes—spending cuts or politically acceptable tax increases—appear blocked. The core argument turns on regression to the mean in real interest rates: after years of near-zero rates following the financial crisis, rates are normalizing, which means US interest payments on federal debt are set to double or triple in the coming years and soon exceed defense spending. Rogoff contends this arithmetic will resolve itself not through fiscal discipline but through a second wave of high inflation—cumulatively 20–25 percent above target over the next five to seven years—that effectively erodes the debt burden, followed by higher taxation once inflation forces the issue.
The conversation ranges across the global economic landscape and its political underpinnings. Rogoff anchors his fiscal pessimism partly in political business cycle theory, arguing that both parties have incentives to borrow regardless of which holds power, creating an irreversible ratchet effect. He surveys how financial repression—forcing banks and pension funds to hold government debt—will likely accompany inflation in every advanced economy, though at the cost of slower growth, and he examines Europe's compounding crisis as rising rates meet already-high taxes and the need to remilitarize. The one scenario Rogoff sees as genuinely transformative is AI-driven productivity gains, which alone might break the bind by raising real returns and growth sufficiently to make debt manageable without deflation or painful choices. He also wanders into currency mechanics, exchange rate theory, Japan's demographic trap, Argentina's historical decline, China's innovation crisis, and chess cognition—a range that reflects the breadth of his concern with how structural imbalances propagate across societies.
Rogoff argues the US is on an unsustainable fiscal path that will likely be resolved through a second bout of high inflation rather than spending cuts, driven by real interest rates regressing toward their historical mean, with transformative AI being the only plausible escape.
- Real interest rates have regressed toward long-term trend, causing US interest payments to balloon past defense spending
- There is little to cut in the US, so adjustment likely comes via taxation or inflation
- AI-driven productivity is the most plausible path to avoid painful fiscal choices
US debt is on an unsustainable trajectory as real interest rates rise toward historical means, causing interest payments to triple and forcing painful fiscal choices.
- Although the recent disinflation showed remarkable central bank credibility, this means a second bout of inflation cannot painlessly solve the debt problem—when the next inflation comes, the credibility that anchored expectations this time will be shot ('fool me twice').
“When we have a second inflation, that time the credibility’s really going to be shot.”
- The most important macro change in the world is that real interest rates appear to have regressed toward their long-term mean from the post-crisis era of near-zero and negative rates, causing US interest payments to at least double and head toward tripling to $1 trillion—more than defense spending—exposing the long-deferred unsustainability of US debt.
“That’s the most important macro change in the world, that real interest rates appear to have regressed more towards long-term trend.”
- The US is on an unsustainable fiscal path with ballooning debt, and within the next five to seven years (maybe sooner) there will be another big inflation—cumulatively 20-25% over the 2% target, more than last time—that brings debt down, but markets will then demand higher interest rates, forcing real choices that point toward higher taxation since there is little to cut.
“I think we’re going to have another big inflation soon, next five to seven years, maybe sooner with what’s going on, and that’s going to bring it down just like it did under Biden.”
- Too much money given to developing countries comes as loans rather than aid, which distorts policy because the loans never get fully repaid; for geopolitically important but uncollectible cases like Pakistan, it would be better to give outright aid rather than perpetually rolling over loans.
“Frankly, what I have advised on things like Pakistan is, just give them aid, don’t give loans. You’re never going to collect the loans.”
Financial repression and other debt-reduction tools slow growth and economic efficiency, as demonstrated by Japan and post-crisis Europe.
- Financial repression—forcing banks, insurance companies and pension funds to hold more government debt—will be part of the solution in every advanced country, but it hurts financial intermediation and makes lending less efficient, contributing to slower growth as seen in Japan and post-crisis Europe.
“Financial repression is going to be part of the solution in every advanced country where you force banks, insurance companies, pension funds to hold more debt.”
- Japan did have the mother of all financial crises in the 1990s, and contrary to the narrative that it 'held on,' its per capita GDP fell from about 80% (and over 100% in dollar terms) of the US in 1990 to about 60% today, falling behind France, the UK and Germany; it now faces trouble as inflation returns, forcing rate hikes and interest payments on debt stuffed into pensions, banks and postal savings.
“It has not held on in per capita terms. It has just not had growth for a long time, and they’re running into trouble.”
- Europe faces an existential crisis as it must remilitarize after free-riding on US defense, but with real interest rates no longer at zero and already-very-high taxes that hold back investment, countries like France will have to make spending choices they have long avoided, and Europe has very few tech or finance world-beaters to fall back on.
“I think this is a real existential challenge to the French state.”
Central bank credibility anchors inflation expectations but is fragile; people mistake short favorable data periods for permanent conditions.
- People have forgotten political economy, wrongly assuming that if a central bank says inflation will average 2% it will; political pressures on monetary policy are important and underappreciated, which is why Rogoff is returning to the topic he pioneered with the first paper on why central banks should be independent.
“I think people have forgotten about political economy. They just think if the central bank says the inflation rate’s 2 percent, on average, it’ll be 2 percent, and we go home.”
- The painless post-COVID disinflation from ~8.9% to near 3% without recession was not caused by supply shocks resolving—because supply chain problems raise prices and their reversal should lower them, but prices did not come down; rather, central bank credibility was remarkably intact since inflation expectations barely moved.
“I certainly do not buy the idea it was all supply shocks. That’s just nonsense.”
- A recurring error, central to Reinhart and Rogoff's 'This Time Is Different,' is that people look at just five or ten years of favorable data and assume it will continue indefinitely—applicable to the recent low real interest rate, low inflation, and the way a generation of students stopped believing inflation could return.
“Carmen Reinhart and I have this book, This Time Is Different—very much on the theme of people just looking at five years or ten years and thinking, “Oh, it’s just great. It’s just going to go like this.””
Partisan political dynamics create a ratchet effect where both parties accumulate debt regardless of ideology, making fiscal discipline impossible.
- Debt keeps piling up because of a partisan dynamic (per Alesina-type models): when the liberal party is in power it spends and borrows because it may lose control in the future, and when conservatives are in power they cut taxes and build up debt—so whoever is in power says don't pay attention to the debt, producing the ratchet we see today.
“When the liberal party is in power, they know that debt is bad, but they know they can spend now. They know they might not control it in the future, so they spend a lot and they borrow. When the conservatives are in power, they cut taxes and build up the debt.”
- Politicians everywhere who have the power try to goose up the economy before an election, and the empirical evidence for this is overwhelming; the paradox his 1987 paper addressed is why this fools anyone, modeling it as a signaling game where voters know they're being manipulated but vote for the incumbent anyway.
“I don’t think there’s any question every politician in the world, if they have the power, tries to goose up the economy before it happens. I think empirically, it’s overwhelming that it’s true.”
Exchange rates are driven by financial frictions and noise rather than fundamentals, making them unreliable policy targets.
- Because exchange rates contain so much noise, policymakers should not look at the exchange rate when setting policy but at inflation and output; trying to target the exchange rate is a fool's game, and if the Trump administration tries it, any success would be pure luck.
“Trying to target the exchange rate is a fool’s game. If the Trump administration’s trying to do it, they might get lucky, but it’s pure luck.”
- Exchange rate movements under floating regimes are driven largely by financial frictions and factors—bank balance sheets, arbitrage limits, pricing imperfections—and a lot of random noise, rather than by real economic fundamentals, which is why exchange rates are so hard to explain.
“a lot of the movements have to do with financial frictions and financial factors, not some gnomes controlling the exchange rate, that there’s a lot of random noise”
- A broad tariff is largely offset by exchange rate adjustment: a 20% tariff on the whole world makes the dollar appreciate roughly 10%, which brings the cost of foreign goods back up only by the net amount and makes your exports more expensive, rebalancing everything—and retaliation tends to cancel out the rest of the effect.
“If you did 20 percent tariff on the whole world, to a first approximation, your exchange rate goes up 10 percent the dollar and that rebalances everything.”
Large-denomination currency is primarily used in tax evasion and should be phased out; cryptocurrency and stablecoins require regulation to prevent evasion.
- Most of the world's large-denomination notes are held in the underground economy and used very little in legitimate transactions, with the large majority going to tax evasion (not primarily drug dealing or trafficking); governments earn seigniorage by ignoring this, which is penny-wise and pound-foolish, so most currency should be phased out over a generation.
“I think most of it is in the underground economy. It’s not necessarily nefarious.”
- Cryptocurrency and stablecoins need to be regulated, and stablecoins will eventually have to have some kind of parallel revealability to what bank accounts have so they cannot be used to evade taxes and regulations; US regulators can mitigate but not eliminate offshore evasion, so the US—which is currently winning—should not be first to experiment with a retail CBDC.
“I think stablecoins eventually have to have some kind of parallel revealability to what bank accounts have.”
Talent and successful companies drain from Europe and other regions to the US tech sector, explaining productivity gaps between economies.
- Top chess players differ along a calculation-versus-evaluation axis: Carlsen describes himself as an evaluator who 'just knows where the pieces go' rather than the best calculator (citing Karpov similarly), while Kasparov was a fierce calculator—and calculation ability tends to peak at a younger age while other tools develop with experience.
“he said, “I don’t know how Karpov does it. He just knows where to put the pieces. He just knows where everything goes, and he’s not having to calculate like I do.””
- Slow UK and European productivity growth is partly explained by a 'sucking sound' of talent drained to the US tech sector—exemplified by DeepMind, a British company that ended up in California—so that when something goes well in Europe, the US absorbs it; if you removed the US tech revolution, US growth numbers would look like Europe's.
“part of it is this sucking sound of the United States with the brain drain that we have. You and I both know about DeepMind, British company ends up in California.”
Technological change, particularly an AI revolution, is the most plausible path for the US to avoid major fiscal adjustment through productivity gains.
- The most plausible scenario where the US avoids a major fiscal adjustment is that the AI revolution works magically better than imagined, with displaced workers acquiescing to government transfers funded by 'robot income' that keeps incomes high—technological change is the thing most likely to bail out US finances.
“It’s that the AI revolution turns out to just work magically much better than anyone imagined... and the robot income pays for everything. AI is absolutely the thing which is most likely, some kind of technological change.”
- AI will raise the real interest rate: although demographics normally lower rates because fewer workers mean lower returns on machines, if AI substitutes for labor rather than complementing it, that downward effect need not hold even in models like Samuelson's or Solow's, while AI also raises productivity.
“And by the way, AI will raise the interest rate.”
Chronic defaulters like Argentina need balanced budgets as an essential starting point, though structural debt problems remain difficult.
- Milei is Argentina's best chance in a long time because the unprecedented thing he has done is balance the budget—the essential starting point for a chronic defaulter is figuring out how not to borrow—bringing inflation down from 200%, though his libertarian visions may not fully come to pass and large debt problems remain.
“The thing that he’s done that I have not seen before is balancing the budget. If you’re a big borrower and you keep defaulting, a starting point is figuring out how not to have to borrow money, and he’s managed to do that.”
- Argentina was one of the richest countries in the world by any measure at the turn of the 20th century in 1900, but is now a lower-middle-income country with per capita income below Brazil, largely due to Peronism and socialism.
“Argentina, as you know, was one of the richest countries in the world by any measure at the turn of the 20th century in 1900. Now they’re a lower middle-income country. Their per capita income is below Brazil”
Trade deficits are unsustainable only if debt is unsustainable; they reflect underlying macroeconomic savings and investment, not policy targets.
- There is no such thing as an unsustainable trade deficit—only unsustainable debt; the trade balance is a result of underlying savings and investment macroeconomic factors, so it shouldn't be targeted directly even when large.
“No. There’s unsustainable debt. There’s not particularly an unsustainable trade deficit.”
- China's trade balance surplus is only about 2% of its GDP—down from 10% in 2010—but because the Chinese economy has grown so large, that surplus is still huge relative to the rest of the world.
“The total size of their trade balance surplus is only 2 percent of GDP. It’s not 10 percent, the way it was in 2010, but they’ve gotten a lot bigger. It’s still huge compared to the world.”
China's growth imbalance toward investment and oppression of the private sector has collapsed innovation, requiring restoration of private sector agency.
- China's growth has been very imbalanced—investment near 40% of GDP versus US 70% consumption—and shifting to consumption is hard given lack of medical care, social security and the legacy one-child policy; more fundamentally, their economy-wide rate of innovation has collapsed because they oppressed the private sector, which is the root of innovation, so they must restore agency to the private sector to grow again.
“Their rate of innovation over the whole economy — I’m not talking about the highest level — has collapsed by many different measures. The private sector is, of course, the root of all of the innovation. They have oppressed the private sector, particularly in the last 10 years”
Dollarization is a desperate measure because physical currency is only a small part of money supply and cannot truly backstop banks.
- Dollarization is a desperate measure whose biggest cost is that you cannot bail out your own banking system, because the physical currency is only a small piece of the money supply while bank deposits represent most of it without real dollar backing; only Hong Kong has enough dollar reserves to truly backstop its banks.
“The biggest cost is if your banking system runs into trouble, you can’t bail them out.”
Covered interest parity no longer holds because post-crisis bank regulations limit arbitrage capacity, revealing structural financial market changes.
- Covered interest parity—the textbook law that borrowing in one currency and hedging via a forward contract yields the same interest rate as borrowing in another—is no longer true, apparently because post-crisis bank regulations restricting balance sheet size prevent banks from arbitraging the deviation away.
“we thought of what we call covered interest parity as just something that holds like law... It’s not true anymore.”
Italy's pensions consume 15% of GDP with declining fertility and worsening demographics, creating severe fiscal constraints alongside high tax rates.
- Italy spends a mind-numbing 15% of GDP on old age pensions and support, roughly double the United States, while facing a TFR around 1.3 and a worsening age pyramid, creating severe fiscal constraints alongside very high tax rates.
“they spend a mind-numbing 15 percent of GDP on old age pensions and support now. We’re half that all in — 15 percent of GDP.”