Ken Rogoff on China's Stalled Boom, America's Coming Inflation Test, and the Luck Behind Dollar Dominance

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Overview

Ken Rogoff is a Harvard professor, a former Chief Economist of the International Monetary Fund, and the author of Our Dollar, Your Problem. In this conversation with Dwarkesh Patel, recorded at Harvard, Rogoff argues three things. China has overbuilt its way into a deep crisis that will take years to escape. The United States has a debt problem that will most likely end in a burst of inflation, not a Greek-style default or a Japanese-style financial collapse. And America's long run of economic and monetary dominance rests partly on luck, which Rogoff thinks may be running out.

36 min read

Meeting China's leaders, and what changed under Xi

Patel opened with Rogoff's many encounters with Chinese officials, which the book describes as largely positive. Rogoff said Chinese leaders listen to everybody, and are "way better than we are at hearing a hundred different views." His own advice was one voice among many. He once lectured at the Party's training school, which rising mayors, provincial governors, and bureaucrats attend and which Rogoff compared to Harvard Business School for them. The officials there asked unusually raw questions, and Rogoff was told that anything could be said inside the school. His impression was that the system selected for competence, alongside the usual loyalty tests.

Rogoff believes Xi Jinping, president since 2013, has gradually dismantled that system and promoted loyalists who are less technocratic. The talk Rogoff considers his most important in China came at the China Development Forum in 2016. It was held in a giant hall with most of the top Party leaders present, along with tech figures such as Mark Zuckerberg. He told the audience that China appeared headed for a classic housing crisis, that its catch-up phase was over, that its demographics looked poor, and that power in the economy seemed to be centralizing. He added that, as a Western economist, he did not think that last trend would be good for growth. Patel noted that the book says Rogoff had submitted a milder version of the talk in advance. Rogoff said he never uses notes and decided in the moment to address "the elephant in the room." Afterward, a couple of top leaders came up to thank him. He recalled half-expecting to be jailed. Professors can speak this way, he said, because business people cannot afford to, and the worst the hosts can do is not invite you back. They did invite him again, though the second time he spoke to a tiny room rather than the main hall.

Rogoff is now less impressed with Chinese leadership, and he worries about competence on both sides. In his view, the average quality at the very top has declined in the US as well as in China, and if China's crisis deepens or US–China tensions escalate into an entanglement nobody wants, two less competent governments are "a recipe for having bad things happen."

The 2010 stimulus and the growth slowdown

Patel asked whether it is fair to blame Xi when the 2010 stimulus that sowed today's problems was launched under Hu Jintao. Rogoff answered that Hu started it but Xi's government kept it going. The key innovation was local government debt. Local governments lacked adequate revenue sources, so they were allowed to sell land and fund construction companies to sustain themselves, and this became an ongoing stimulus program.

When Xi took over, well-connected Chinese contacts Rogoff trusts, including a former IMF colleague, told him Xi would be a "Ronald Reagan" who would finally liberalize markets. Rogoff says that did not happen. Growth slowed noticeably once Xi came to power.

Rogoff walked through how China's growth is measured. Converting reported output at market exchange rates makes China's growth look spectacular. Purchasing-power-based measures, which try to capture how ordinary people and firms actually live, show less. By Rogoff's figures, from 1980 to 2012 official growth was almost 10 percent while the purchasing-power-parity figure was just over 7 percent. He said he did not have the exact numbers at hand for the Xi era, but that official figures of roughly 6–7 percent might correspond to something like 3.5 percent. Some slowdown was inevitable, he granted, but he thinks Xi's reluctance to take risks helped produce the current situation.

Ghost-town infrastructure in China's tier-three cities

Rogoff's central diagnosis is overbuilding in both infrastructure and housing. About 60 percent of Chinese income comes from what China calls tier-three cities. Rogoff compared them to Rochester, where he grew up, or to Cincinnati, Liverpool, or Rouen. China invested heavily there, and the cities have "amazing roads, amazing real estate, amazing housing," but Rogoff described a "feel of death" in them. He compared China to the Soviet Union, which was very good at building cement factories, steel plants, and railroads until that approach ran its course. Green energy, AI, and electric vehicles exist, but by Rogoff's account they remain tiny compared with infrastructure and real estate. By some measures, he said, real estate is a third of the economy.

Patel described visiting a town of half a million people outside Chengdu six months earlier. Its train station, residential compounds, and movie theater seemed far out of proportion to the population. A recently built Buddhist temple complex took perhaps ten minutes to drive through, with shrine after shrine arranged in concentric layers, and there were almost no visitors. Rogoff added that the young people he meets do not want to live in such towns and the jobs are not there. He admitted he could not fault the strategy in hindsight: in 2005, he says, he would have endorsed pushing development toward smaller cities to relieve overcrowding of the kind seen in São Paulo or Mumbai, and he would have been wrong. Reorienting an economy away from construction is hard because people are not that flexible, much as it would be hard if AI suddenly displaced large numbers of workers.

Low consumption, not just financial repression

Patel asked whether market-based allocation of China's investment, rather than financial repression, would have avoided the problem, given that China's huge savings have to go somewhere. Rogoff said the standard advice to China has long been that its saving and investment rates are astounding. He put savings at perhaps still 45 percent. US consumption is pushing 70 percent of the economy and Europe's is in the low 60s, while China's consumption is very low and much of the country lives on incomes around $200 a month. China could transfer income to households, let them consume instead of exporting, or allow the currency to appreciate at times so imports become cheaper. It has been reluctant to do any of these.

The key to getting households to spend, Rogoff argued, is security. China has nothing like US Social Security, so people must save for old age. Healthcare comes through large state-owned employers or not at all. Citizens are generally not allowed to invest abroad. The current situation is worse because housing, which along with low-yielding bank deposits was essentially the only savings vehicle, is falling in price, and people are cutting back. Rogoff believes China can dig its way out, but there is no magic bullet to deliver 5 percent growth. He noted that 5 percent is the official figure and said he does not think China is anywhere near it. The general goal should be rebalancing from investment toward consumption.

Which GDP measure matters for military power

Rogoff's book argues that nominal, market-rate GDP is the better comparison of geopolitical power, because you cannot buy Patriot missiles or oil with purchasing-power-parity dollars. Patel pushed back: for military strength, isn't it more relevant that China can build ships and munitions more cheaply and pay soldiers less? Rogoff agreed. China "just crushes us in shipbuilding," partly because of the symbiosis between commercial and military shipbuilding, and he believes China has about 50 percent of the global market. By contrast, a new US aircraft carrier takes years and enormous expense. Rogoff thinks one US mistake is trying to build everything domestically instead of relying on allies such as South Korea, which is very good at shipbuilding. The US advantage at the moment is technology, and if that dissipated it would hurt.

Why Rogoff doubts China will overtake the US

Asked for projections, Rogoff said he had thought China's nominal GDP was below the 75 percent of US GDP Patel cited. He had been going to predict 75 percent by 2030. At one point in 2024 it was around two-thirds, but the ratio swings with exchange rates, and a strong dollar makes the US look bigger. His estimate is that China gains perhaps one percentage point a year on the US, which means it would take a long time to surpass the US in absolute size, even though China has four times the population.

Rogoff pointed out that Goldman Sachs and others once projected that the US would soon be to China what Canada is to the US, and those extrapolations proved wrong. Economists consider themselves terrible at trend extrapolation, he said, and he cited the late Dick Cooper's list of failed forecasting commissions. His gut instinct is that China is following the path of Japan, other Asian economies, and the Soviet Union, while the US retains a dynamism and creativity that other large economies have not replicated. He added that the US may be "screwing it up right now" with tariff wars and deglobalization. China and France build excellent high-speed trains, he said, while the Boston–New York train is "no high-speed train," but the really creative work is where the US excels.

Patel called the forecast extremely bearish, since even China pessimists often expect China's economy to reach 125–150 percent of US nominal GDP by 2040. Rogoff replied that China is digging out of a crisis. Prices are falling, and not because of rapid innovation. Interest rates are being pushed to zero. He reads both as signs that demand has been crushed. Chinese statistics were historically accurate on average as far as anyone could tell, he said, but he thinks that has become less true under Xi.

Monetary warning signs of a Taiwan conflict

Patel asked whether there are financial signals, analogous to satellite images of docks, that would reveal Chinese preparation for moving against Taiwan. Rogoff does not expect any sudden moves. China's reserves are shifting steadily into gold. Moving into euros or Canadian dollars would not help much, because those countries might side with the US. China has not, as far as he knows, diversified into crypto, which a student of his studied. Officially China holds about a trillion dollars in Treasuries, but a student's paper that Rogoff finds persuasive estimates the true figure at about $2 trillion, held partly through proxies.

The bigger vulnerability, in Rogoff's view, is that the payment "rails" or "pipes" of the global system (the mechanisms that clear cross-border payments between banks) are disproportionately controlled by the US. China could live without its $2 trillion for a while, he said, but not without the ability to pay suppliers. So it is developing its own payment mechanisms, as Russia did before invading Ukraine. It might also be quietly selling Treasury bills, which Rogoff said he would advise if he were a Chinese economist. What China does not want is to be the one that brings down markets and causes a global crash. China can push alternative settlement onto African and Latin American countries, some of them almost client states, and Iran sells it oil despite sanctions. The important part is not the invoicing currency but how the books are cleared. Europe is building similar capacity too: Rogoff said its central bank digital currency is moving faster than he expected, partly with international payments in mind.

Japan: how US pressure and a financial crisis cost a generation

Patel asked how much of Japan's decline was due to specific policy mistakes rather than structural forces. Rogoff agreed demographics matter most obviously. Competition matters too, including from China and Korea, because Japan pioneered an export-led growth model that others copied. The model had an under-appreciated virtue: most countries are too small to sustain much domestic competition. Rogoff recalled that Mexico once had just two telephone companies, two bread companies, and two taco companies. Export sectors, by contrast, compete with the whole world, which drove innovation in Japan and to some extent Germany. Over time, imitators eroded that edge.

Still, Rogoff sees the financial crisis as a very big factor. Without it, he estimates Japan might be 50 percent wealthier per person. Later he allowed that 25 or 30 percent might be more accurate, but either way "a lot better shape." In the late 1980s Japan was richer than the US at market exchange rates, and even by more complex measures richer than Germany, France, and Italy. Now it is near the bottom of that group.

This is a subject on which Rogoff has changed his mind. In 2005, when he suggested China loosen its fixed exchange rate, then-president Jiang Zemin told him, in Rogoff's account, "That's what the United States told Japan. Look what happened to Japan," and Rogoff heard the same from many others. He used to dismiss this, because the Plaza Accord, in which the US pushed Japan to let its currency float more freely, came in September 1985, while he and Carmen Reinhart date the crisis to 1992. Recently he has concluded he was wrong: crises unfold slowly, and the US effectively forced Japan to open up and deregulate faster than it was culturally and politically ready for. Rogoff related that someone who attended the Plaza Accord's tenth-anniversary event in Tokyo told him that the man who had headed the Bank of Japan in 1985 symbolically apologized to officials, saying he had ruined the country and took responsibility. The general lesson Rogoff draws is that financial repression is bad, but liberalization must be gradual, because doing it too quickly causes many crises.

Why financial crises cause lasting losses

Patel asked how a financial crisis decades ago could still leave a country producing much less. Rogoff said Japan's case is unusual in magnitude, but permanent losses of 10 or 20 percent are typical. He recalled an MIT professor drawing the Great Depression as a growth path that fell and resumed at the old slope without ever recovering the lost level. In Japan's case, the crisis "blew up their business model." With functioning financial markets and freer borrowing, Rogoff suggested, China might not have overtaken Japan so quickly. Japanese consumption collapsed, and its consensus-driven society, which did not want anyone left in bad shape, struggled for a long time to work through losses. The US, Rogoff said, was far more brutal in 2008 but got out quickly, though perhaps not back to where it had been.

Asked for the equivalent US counterfactual for 2008, Rogoff hesitated because he may have published a figure. His rough answer was that the US economy is probably about 15 percent smaller than it would otherwise have been, compounded by the political crisis that followed, which he regards as still an echo of 2008. He allowed that the crisis may have produced some healthy cleansing but thinks the damage was greater. He pointed to Greece and Portugal, where growth returned but the lost ground was not recovered. In their 2009 book This Time Is Different, he and Reinhart argued that recessions following financial crises are longer and deeper than normal ones. He recalls being mocked, including in a two-page New York Times spread. There are exceptions, such as Sweden, which recovered in a year or two, but Rogoff says the pattern is the norm.

America's likely path: an inflation crisis, not a default

The book predicts another inflation spike within a decade and calls the US fiscal position unsustainable. Rogoff's general model is that crises come when debt is high, the political system is inflexible, and an unanticipated shock hits. In his view the US checks the first two boxes.

Japan responded to its troubles with financial repression, stuffing government debt into insurers, pension funds, and banks. Its central bank holds almost 100 percent of GDP in debt. Rogoff said he recalls the Fed's holdings as around $7 trillion, while the Japanese equivalent would be about $30 trillion. He thinks the US, as a market-driven system, would suffer more from such pressure than Japan did, and it cannot force foreign lenders such as French insurers to hold its debt. So he thinks the most likely outcome is inflation. He is not talking about hyperinflation but 10–20 percent inflation over a period, which works much like a partial default. The recent inflation, he says, knocked about 10 percent of GDP off the debt, but it did not fix the underlying overspending, and next time more may be needed. He expects markets to be unforgiving the next time, treating the US as untrustworthy, which would raise interest rates and accelerate debt growth. Citing the saying attributed to Churchill that Americans always do the right thing after trying everything else, Rogoff expects austerity to come only after other options fail.

Patel listed the four exits: default, financial repression, inflation, and cutting deficits. Rogoff objected to how progressives use the word "austerity," saying it pretends that higher debt has only benefits and no costs, and he cited Ezra Klein's Abundance as acknowledging tradeoffs. He was emphatic that the US will not have a Greek-style crisis. Greece used the euro and had no control over its currency, while the US can print money and never has to default. Japan, using its own currency, had a financial crisis, not a sovereign debt crisis, and did not default in that period (though it did during World War II).

Rogoff drew a sharp distinction here. A financial crisis breaks the banking system and cuts off lending to innovators and dynamic firms. He recounted how Ben Bernanke, his graduate-school classmate and office neighbor at Princeton, wrote a thought piece challenging Milton Friedman's explanation that the Great Depression was caused by too tight a money supply. Bernanke's argument was that if the problem were only money, wages and prices would eventually adjust, so why did the Depression last ten years? Bernanke conjectured that the breakdown of the financial system was the reason. Rogoff said there is still debate, but he reads the weight of evidence as showing that financial crises are very damaging. That lesson has made Treasury and Fed policy "when in doubt, bail it out," which he thinks will eventually cause problems as the financial sector grows, as Silicon Valley Bank's failure showed. On balance he considers an inflation crisis more likely than a financial one, while stressing that these things are hard to predict.

Overconfidence in Fed independence

Patel asked whether bond markets are irrational, given that history suggests inflation is coming. Rogoff's main answer is that markets place too much faith in the Federal Reserve's independence. The Supreme Court had recently indicated that Trump could not fire Chair Jerome Powell, but Rogoff thinks Congress and the President have many ways to override the Fed, especially if they declare some wartime or "war-on-pandemic" emergency. Patel suggested politicians may like Fed independence as a way to pass the buck. Rogoff agreed and said that is one reason Trump bashes the Fed: it gives him someone to blame for not lowering rates if a recession comes, though Rogoff believes Trump also genuinely disagrees with the Fed.

Rogoff cited current rates: about 4.5 percent on the 10-year Treasury, a little over 2 percent on its inflation-indexed counterpart, and about 5 percent on the 30-year bond. He expects them to drift upward, raising the cost of mortgages, student loans, car loans, and business loans. A shock, possibly one from AGI, could provide the occasion to temporarily take back the Fed's independence. Rogoff noted that he wrote the first paper arguing for independent central banks when almost none existed, so he is "talking my own book" in the sense of his human capital. He said the Fed fights for its independence every day. He hears senators call Fed officials idiots, and while such talk used to come from progressives, he now hears tech titans argue that Treasury Secretary Scott Bessent is smarter than Powell and should run things.

Can the Fed's model be copied?

Patel asked what makes the Fed work and whether other agencies could be run the same way. Rogoff credited its single, widely felt barometer, inflation, which the public perceives mostly through gasoline prices and which the Fed controls over the long run. Most government decisions create winners and losers and quickly become political, which is harder for an unelected body. Asked what he would tell the Pentagon if it wanted to be run like the Fed, Rogoff said that until now it has been run "pretty darn well." He acknowledged claims that Elon Musk can put a payload into space for a fifteenth of NASA's cost, but argued that military spending that looks wasteful may reflect the fact that you never know where the next blow will come from. He suggested crypto regulation as a better candidate for independence, since it has been overrun by politics. He called the Supreme Court position that the president can fire the head of any agency, and by inference perhaps anyone in it, a terrible mistake, because switching everything every four years is "very worrisome."

Rogoff disputed Patel's suggestion that the Fed has avoided mission creep. Its working papers in recent years were dominated by inequality, the environment, and social justice, and it was hard to find one on monetary policy. Part of independence, he said, is "bending with the wind" while keeping the core function intact. He pointed to Turkey, where inflation approached 100 percent and President Erdoğan repeatedly fired central bank heads who tried to raise rates, and said the US has been lucky.

On whether younger economists will erode the Fed's focus, Rogoff was optimistic. The recent inflation miss was a wake-up call. He cited a Hoover blog analysis finding that "inflation" had not appeared in the abstracts and titles of the American Economic Association meetings in 15 years until this year. He believes the academic market, with its competitive publishing and "ruthless" seminars, corrects large errors. Ten years ago, he said, he was a lone voice. Students listened to his inflation lectures as if he were teaching them the music of Fred Astaire, and American students assumed debt did not matter, although foreign students knew otherwise. That has changed.

Financial repression then and now

Patel asked how damaging financial repression would be, given that post-war repression coincided with America's fastest growth. Rogoff said the post-war situation was unique. The Great Depression had already wrecked financial markets. The war economy was command-and-control, and workers produced with genuine patriotism. Returning soldiers gave a huge growth lift. Repressed markets also meant no financial crises for a long time. Crises often begin when someone promises faster growth by removing all regulation overnight.

The decisive difference is private debt. Federal debt after World War II was about as high as it is now, but most private and state and local debt had been defaulted on. Rogoff suggested, while calling it slightly hyperbolic, that total debt was perhaps 50 percent of GDP. Today private and state and local debt far exceed federal debt, and financial repression would strike at the business models of the financial sector.

After the shock: slow adjustment and the question of AGI

Rogoff expects the eventual crisis to be a wake-up call: a shock arrives, the US wants to borrow heavily, bond yields rise faster than in past episodes, and the government cannot do as much as it wants. It would not be the end of the world. He noted that during the 2010–2012 European debt crisis, many countries raised retirement ages with changes phased in 10 or 15 years later. But it would be unpleasant, and because the global system is dollar-centric, it would hurt the whole world and the dollar's franchise, pushing US rates higher still. He said "hysterical is definitely within the realm of possibility," while stressing that his forecast is "more likely than not" rather than certain, and that high-skill immigration and faster growth could change the picture. Growth would pause, he said, because unlike a stock crash, a debt crash has no automatic way of allocating losses, and working out who owes what can take five or ten years. He added that the belief that China's president could simply dictate the allocation has proved less true than many thought.

Patel asked whether one can believe both that AGI is near, meaning all computer-based white-collar work is automated within 20 years, and that US finances are untenable. Rogoff said a fast productivity boom would be fantastic and could solve problems. But countries have often gotten into trouble even with growth above their interest rates, because fiscal policy is political rather than arithmetic. Nobody, he said, ever defaulted or inflated because they could not do the math. If AGI came that fast and that big, he thinks it would make today's populism "seem like nothing."

On whether AI-driven price declines should be fought with money printing, Rogoff said monetary policy can still work as usual. Demand can be raised so that prices of final goods, raw materials, and inputs rise even as AI cheapens some services. Productivity growth generally makes the Fed's job easier and reduces pressure to inflate. Patel then asked whether the traditional reasons for positive inflation, such as downward wage rigidity, still apply if AIs do the jobs. Rogoff called it a very good point. Keynes's key insight was that prices were not falling in the Depression when they should have, and that stickiness is mostly about human behavior, especially workers. If firms using "docile" AI are willing to let prices fall, falling prices would be tolerable, though Rogoff wondered aloud whether there would still be human workers.

Rogoff expects AI to push real interest rates up, which would make deflation manageable: the Fed could simply let rates rise a bit less. The problem after the financial crisis and the pandemic was that rates hit zero and authorities felt unable to go deeply negative, a topic on which he has written a whole book. He cited AI's enormous energy needs as one source of upward pressure. He also cited work by Daron Acemoglu and others showing that investment need not raise wages: if AI substitutes for workers, capital becomes more valuable and investment increases further.

Patel asked whether the government should lock in hundred-year bonds now. Rogoff said he would get to that but instead turned to where rates stand, and did not return to the bond question. Inflation-indexed debt is only about 10 percent of US debt but gives a reasonable read on real rates. The 10-year real rate hit about minus one percent after the pandemic and averaged roughly zero from 2012 to 2021. Rogoff regards today's higher level as a normalization, though he acknowledged that many younger colleagues believe aging and slow innovation will keep rates low. He expects long-term rates to rise, with AGI being only one piece. The other pressures he listed are rising debt everywhere, remilitarization, climate spending or climate disasters, populism, and geopolitical fracturing. In his view, rates will rise not just for the good reason that the world has become more creative.

Foreign equities, Europe, and the regression-to-the-mean bet

The book predicts a rebalancing from US toward foreign equities. Rogoff framed the claim concretely: when the dollar is very strong, expect the euro to rise. Exchange rates were the subject of his first important paper, and although they are very hard to predict, he thinks the euro will do well. Europe has much room to catch up. He wrote before Trump's election that Europe faced pressure to rearm, anticipating that a Harris administration would likely cut US defense spending. He argues rearmament would be good for the euro, European technology, and Europe's geopolitical weight.

He disclosed his track record for calibration. His mathematical textbook, Foundations of International Macroeconomics, argues for diversification. He once made a Merrill Lynch video on international diversification with Zbigniew Brzezinski, for which he was paid, and it circulated in half a million copies. Friends teased that he would have made more money not following his own advice. Still, he expects some regression to the mean in the US premium, "maybe not with AI all being in the US, I don't know." Pressed on whether he expects US stocks to slow or foreign stocks to do even better, he would only say foreign equities will outperform dollar equities. He holds a neutral portfolio because he advises policymakers, and he does not claim to be good at investing.

Patel raised the backtesting problem: countries persistently behind the frontier may be behind for deep reasons. Rogoff agreed. Asia's lower price-earnings ratios, he said, reflect governance problems investors do not trust. But he does not think Europe is hopeless, and he sees a dim awareness there, as in California, of overregulation. Referring to the Boston Celtics' recent loss to the Knicks with star Jayson Tatum injured, he said Europe need not improve to do better if the US is hobbling itself, which he thinks is happening to some extent.

No institutional fix for the debt bias

Asked about reforms to curb bipartisan deficit bias, Rogoff said fiscal councils have been tried widely without much success. He co-wrote a paper on them with Julia Pollak when she was an undergraduate. The UK has gone furthest: a fiscal authority set up under Chancellor George Osborne produces its own forecasts, so the government cannot invent its own numbers. The US Congressional Budget Office is very good, Rogoff said, but must accept Congress's assumptions, such as a tax provision that is supposedly temporary. Rogoff thinks the deeper fixes lie in the electoral system and campaign finance. Patel questioned whether term limits would help, suggesting that longer tenure might lengthen politicians' horizons, and that populism, not money in politics, may drive deficits. Rogoff conceded he has no magic solution. No country has found one, and the only encouragement is that these things come in waves.

He described the continuity problem: any president's policies are likely to be reversed by the next one from the other party. The US has sometimes done well precisely because its government is weak and the private sector works around it. He called these political rather than economic questions but offered Brexit as "democracy gone amok." He said he does not know whether Brexit was right, but that a decision like that should require something like a two-thirds vote rather than a simple majority. He noted voting experiments in Washington State and Maine.

On low-debt countries, Rogoff said debt is only one factor. Commodity exporters such as Australia and Canada face volatile income and tend to save for rainy days, and Norway is "in a whole other league." Canada, though, has large housing debt. He stressed that he remains bullish on the US. He recalled living alone in Europe as a teenage chess player in the late 1960s and not wanting to return after Nixon's election, partly out of fear of the Vietnam War draft. He said many young people now feel about Trump the way he felt about Nixon, but he thinks the US is great.

The exorbitant privilege: a real advantage, not a trap

Patel asked whether reserve-currency status tempts the US into unsustainable borrowing that must later be refinanced at higher rates. Rogoff said he has heard the argument but thinks the privilege is basically great for the US. With $37 trillion in government debt, paying half a percent to a percent less amounts to hundreds of billions of dollars, and private borrowers benefit too. The dollar network underpins much of US intelligence gathering and enables sanctions, which the US has at times used in place of military intervention. Not appreciating this, Rogoff said, would be "a terrible blunder that we might be making right now."

On whether the US is getting real goods for paper, Rogoff said the core benefit is that the US borrows by issuing safe assets and invests in risky ones. Charles Kindleberger, his professor at MIT, called the US "bankers to the world," earning something like the equity premium on its balance sheet. Dollar liquidity also lets US firms issue debt internationally in a way a French firm could not. Rogoff noted that the UK, no longer the dominant currency, still runs large current account deficits and is even more financialized than the US, which is why Trump could strike a trade deal with it. He addressed Stephen Miran, a former Harvard student who heads Trump's Council of Economic Advisers, whose argument is that global demand for dollars makes the US less competitive and hollowed out manufacturing. Rogoff sees "a little bit of truth" in it, but the dollar fluctuates, and US strength in tech, biotech, and agriculture also pushes the currency up and bids up costs, making manufacturing harder.

Patel raised Charles Mann's 1493, which describes how Ming-era China, after unstable paper currencies, absorbed vast amounts of New World silver in exchange for real goods. Rogoff compared this to dollarized countries such as Ecuador. The US effectively prints what they hold, and they accept low interest rates on Treasury bills. He noted that China invented paper currency long before Europe and then printed too much of it.

Good, but also lucky

In closing, Patel asked what explains America's durability against the Soviet Union, Japan, and China. Rogoff noted that even after Europe partly left the dollar bloc in the 1970s, globalization spread the dollar to China, the former Soviet Union, and elsewhere, making it bigger than the British pound at the empire's height, which surprised observers like him. America has done good things, but its rivals also blundered. Japan accepted US pressure. China, in his view, clung to the dollar too long. Europe should have delayed Greece's entry into the euro. He quoted chess grandmaster Bent Larsen, who, asked whether he would rather be lucky or good, answered "Both." Americans know they are good, Rogoff said, but forget they have been lucky, and if history were rerun it need not turn out the same way.

Patel compared this to the Fermi paradox: if it is so easy for countries to fall into a rut, perhaps there is a filter that makes continued success rare. Rogoff said he hopes not. He does not think Trump caused the dollar's "gentle decline," which he believes would have happened under Harris too, but he sees events like "Liberation Day" and the erosion of independent agencies undermining the rule of law. Foreign investors used to assume that even if their stocks or real estate lost value, they would be paid, and that assumption is now "in doubt." When he previewed the book's argument to academics, financiers, and tech people, they told him he was "nuts." He said he does not know if he is right but thinks it is worth considering.

Patel recalled Chinese venture capitalists who were depressed because investors feared the government could cancel the IPO of the next Alibaba. Rogoff concluded that Europe has a bright future as "the team that doesn't have as many injured players," while China will not be in trouble forever but, he expects, will remain so for five or ten years.