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Strategies
Traders have repeatedly shrugged off President Trumpâs disruptive tariff wars and fiscal policy, pushing U.S. stock prices back into expensive territory, our columnist says.
Credit...
Giulio Bonasera
Published July 11, 2025
Updated July 12, 2025
Market meltdowns have been a big worry lately, and for good reason. With President Trump imposing the highest tariffs since the Great Depression and enacting myriad other disruptive policies, the threat of another market crash canât be ignored.
Yet despite an 18.9 percent downturn in the S&P 500 earlier this year, the stock market has
rebounded
. It has continually shrugged off shocks that, in previous years, may have set off a prolonged bear market.
In fact, stocks have become expensive again. While the potential for a serious market downturn hasnât vanished, I think itâs also time to begin thinking about another problem: the danger of a market melt-up.
By many measures, weâre already in perilously overvalued territory. On a historical basis, share prices are high in relation to corporate earnings, assets and the size of the overall economy.
I donât want to go too far with this. The U.S. stock market isnât nearly as expensive as it was at the height of the dot-com bubble in the late 1990s and early 2000. But it is increasingly pricey â surprisingly so, when you consider the repeated blows to market sentiment dealt by the Trump administration.
Tariffs re-emerged as a major issue over the past week. The administration issued an array of announcements: Tariffs will increase, be delayed, not be delayed, be imposed on copper, be negotiated lower, be made permanent, and on and on. Who really knows? The stock market has been absorbing this information, stumbling from time to time but then regaining its footing. While the economic impact of the tariffs has barely been felt yet, the stock market remains much higher than it was at the beginning of the year.
How High?
One sign that the âmarket is a little out over its skis,â as Bespoke Investment Group put it in a note to clients this past week, is that shares of companies that are making no profit have been rising faster than those that are deeply profitable. Bespoke, an independent financial research firm, said, âFor stocks that are losing money, generally speaking, the bigger the losses the better the returns.â
Companies with marvelous narratives about future returns are capturing investorsâ imaginations. For example, a leading stock in the Russell 3000 index, with a gain of more than 500 percent this year, was Aeva Technologies. It makes sensors for robots, autonomous vehicles and drones â all hot items these days. Yet the company is losing a ton of money.
No matter. In the current market, the sky is the limit. Referring to the astonishing stock performance of money-losing companies, Bespoke said: âThis is, to put it mildly, an unsustainable dynamic. Valuations can only do so much to support markets before the trend reverses. Of course, there are other sources of market return other than multiple expansion of no-earnings companies, but this dynamic is still emblematic of a market that is starting to get carried away with itself.â
Moneymaking companies are receiving remarkably high valuations, too. Take Nvidia, which this past week became the first company to pierce the $4 trillion threshold for stock market capitalization. Nvidia is highly profitable, and it designs many of the advanced chips that power artificial intelligence Nothing seems to be more prized than A.I. in the market right now.
Nvidia stock is extremely expensive: Its price-to-earnings ratio is above 50:1, according to FactSet. That means that an investor must pay more than $50 for every $1 of the companyâs earnings. Compared with the start of 2023, when its price was 250 times its earnings, the company may look like a bargain. Even so, its current valuation implies that its profits will grow at lightning speed for decades to come. The market may be comfortable with that assumption, but the law of gravity makes me
question
whether Nvidiaâs price is sustainable.
Booms and Busts
Steep market valuations alone donât cause price declines, but in the past, they have eventually led to trouble.
Alan Greenspan
, the former Federal Reserve chairman, warned elliptically of excessively high stock prices in December 1996, when he famously asked, âHow do we know when irrational exuberance has unduly escalated asset values, which then become subject to unexpected and prolonged contractions?â
He didnât provide a clear answer. In response to Mr. Greenspanâs words, the market foundered but then shot up further. It wasnât until March 2000 that stock prices â by then wildly exorbitant by most measures â ultimately crashed.
Irrational exuberance has become standard Wall Street jargon. Robert Shiller, the Yale economist and Nobel laureate,
used
the phrase as the title for an important book.
Melt-up isnât as widely used, but it may be on the verge of becoming so.
âThe melt-up in risk assets continues,â HSBC, the global bank based in London, warned recently.
It saw two distinct possibilities: an intensifying melt-up reflecting investor exuberance or a meltdown in the face of what could turn out to be endlessly troubling developments, many of them meted out by the Trump administration.
âThe bearish narrative can point to tariff rates,â the bank wrote. But, HSBC also said, Wall Street analysts have lowered expectations for corporate earnings to a level that most companies are likely to exceed. Therefore, it concluded, âWe have the perfect recipe for the broad-based melt-up in risk assets to continue.â
Melt-ups have long been part of the vocabulary of Edward Yardeni, the independent Wall Street economist and strategist. At the moment, he said, the market is âsort of, kind of, in a melt-up.â
Referring to the sharp stock downturn earlier this year, he added, âJust look at the way this correction has been reversed, itâs been a melt-up.â Stock valuations are âpretty rich,â he said, and people in the markets are âback to believingâ that artificial intelligence is âa miracle technology.â
In an email, he estimated a range of âsubjective probabilitiesâ for the stock market. There is a 60 percent chance that the bull market will continue, he said, a 25 percent chance of a bear market caused by a recession, and a third possibility: a 15 percent chance of a melt-up.
In a melt-up, stocks would spiral much higher, generating big gains on an unstable base.
The gains would be wonderful. But any provocation or disruption could set off a severe downturn.
Donât Get Too Excited
âMarkets can remain irrational longer than you can remain solvent.â Thatâs an adage often attributed to the British economist John Maynard Keynes, though Iâve never found proof that he said it. Nevertheless, itâs apt. I worry about market melt-ups but rarely feel confident enough about my observations to do anything about it in my investing life.
Only occasionally, in my view, is it completely obvious that the market is so high that it must fall, or so low that it must rise. (Such moments are usually accompanied by a major shift in policy by the Federal Reserve â lowering interest rates sharply at the bottom of a bear market, or raising them when the economy is so red hot that it is on the verge of burning.) This isnât one of those times. In the second Trump administration, anything is possible for the stock market. It could rise, fall or, more likely, be extremely volatile and vacillate between extremes.
As a long-term investor using mainly diversified global index funds, I try to ride out the marketâs madness, using bonds and cash (much of it in money-market funds) to buffer me from severe stock downturns. Iâve bulked up that buffer this year.
While I take a long-term view, I would prefer a calmer ride. Who needs the agony of a stock market decline, even if you donât intend to touch the money for decades? More important, many people â including those in retirement or planning to start it soon â canât handle major downturns. And market crashes are often associated with recessions.
Melt-ups are much more pleasant than downturns but they cause major problems, too, because they are often followed by crashes.
It would be far better if markets were calm and orderly. So Iâm hoping we have neither a melt-up nor a meltdown now. A traditionally bumpy market, with setbacks but an upward arc, is in nearly everyoneâs interest. So donât get too excited if markets start to fly toward the sky.
A version of this article appears in print on
July 13, 2025
, Section BU, Page 3 of the New York edition with the headline: The Increasing Danger of a Market Melt-Up
.
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Strategies
# The Danger of a Market Melt-Up
Traders have repeatedly shrugged off President Trumpâs disruptive tariff wars and fiscal policy, pushing U.S. stock prices back into expensive territory, our columnist says.
- Share full article
- 405

Credit...Giulio Bonasera
[](https://www.nytimes.com/by/jeff-sommer)
By [Jeff Sommer](https://www.nytimes.com/by/jeff-sommer)
Jeff Sommer writes [Strategies](https://www.nytimes.com/column/business-strategies), a weekly column on markets, finance and the economy.
Published July 11, 2025Updated July 12, 2025
Market meltdowns have been a big worry lately, and for good reason. With President Trump imposing the highest tariffs since the Great Depression and enacting myriad other disruptive policies, the threat of another market crash canât be ignored.
Yet despite an 18.9 percent downturn in the S\&P 500 earlier this year, the stock market has [rebounded](https://www.nytimes.com/2025/07/04/business/markets-investment-returns-trump.html). It has continually shrugged off shocks that, in previous years, may have set off a prolonged bear market.
In fact, stocks have become expensive again. While the potential for a serious market downturn hasnât vanished, I think itâs also time to begin thinking about another problem: the danger of a market melt-up.
By many measures, weâre already in perilously overvalued territory. On a historical basis, share prices are high in relation to corporate earnings, assets and the size of the overall economy.
I donât want to go too far with this. The U.S. stock market isnât nearly as expensive as it was at the height of the dot-com bubble in the late 1990s and early 2000. But it is increasingly pricey â surprisingly so, when you consider the repeated blows to market sentiment dealt by the Trump administration.
Tariffs re-emerged as a major issue over the past week. The administration issued an array of announcements: Tariffs will increase, be delayed, not be delayed, be imposed on copper, be negotiated lower, be made permanent, and on and on. Who really knows? The stock market has been absorbing this information, stumbling from time to time but then regaining its footing. While the economic impact of the tariffs has barely been felt yet, the stock market remains much higher than it was at the beginning of the year.
## How High?
One sign that the âmarket is a little out over its skis,â as Bespoke Investment Group put it in a note to clients this past week, is that shares of companies that are making no profit have been rising faster than those that are deeply profitable. Bespoke, an independent financial research firm, said, âFor stocks that are losing money, generally speaking, the bigger the losses the better the returns.â
Companies with marvelous narratives about future returns are capturing investorsâ imaginations. For example, a leading stock in the Russell 3000 index, with a gain of more than 500 percent this year, was Aeva Technologies. It makes sensors for robots, autonomous vehicles and drones â all hot items these days. Yet the company is losing a ton of money.
No matter. In the current market, the sky is the limit. Referring to the astonishing stock performance of money-losing companies, Bespoke said: âThis is, to put it mildly, an unsustainable dynamic. Valuations can only do so much to support markets before the trend reverses. Of course, there are other sources of market return other than multiple expansion of no-earnings companies, but this dynamic is still emblematic of a market that is starting to get carried away with itself.â
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Moneymaking companies are receiving remarkably high valuations, too. Take Nvidia, which this past week became the first company to pierce the \$4 trillion threshold for stock market capitalization. Nvidia is highly profitable, and it designs many of the advanced chips that power artificial intelligence Nothing seems to be more prized than A.I. in the market right now.
Nvidia stock is extremely expensive: Its price-to-earnings ratio is above 50:1, according to FactSet. That means that an investor must pay more than \$50 for every \$1 of the companyâs earnings. Compared with the start of 2023, when its price was 250 times its earnings, the company may look like a bargain. Even so, its current valuation implies that its profits will grow at lightning speed for decades to come. The market may be comfortable with that assumption, but the law of gravity makes me [question](https://www.nytimes.com/2024/02/22/business/nvidia-price-to-sales-ratio.html) whether Nvidiaâs price is sustainable.
## Booms and Busts
Steep market valuations alone donât cause price declines, but in the past, they have eventually led to trouble. [Alan Greenspan](https://www.nytimes.com/1996/12/07/business/a-buried-message-loudly-heard.html), the former Federal Reserve chairman, warned elliptically of excessively high stock prices in December 1996, when he famously asked, âHow do we know when irrational exuberance has unduly escalated asset values, which then become subject to unexpected and prolonged contractions?â
He didnât provide a clear answer. In response to Mr. Greenspanâs words, the market foundered but then shot up further. It wasnât until March 2000 that stock prices â by then wildly exorbitant by most measures â ultimately crashed.
Irrational exuberance has become standard Wall Street jargon. Robert Shiller, the Yale economist and Nobel laureate, [used](https://press.princeton.edu/books/paperback/9780691173122/irrational-exuberance?srsltid=AfmBOoop4cdds5pTYCjZoeZwEBPTSblz78gRz9daZZG9upWXPw5FaRCK) the phrase as the title for an important book.
Melt-up isnât as widely used, but it may be on the verge of becoming so.
âThe melt-up in risk assets continues,â HSBC, the global bank based in London, warned recently.
It saw two distinct possibilities: an intensifying melt-up reflecting investor exuberance or a meltdown in the face of what could turn out to be endlessly troubling developments, many of them meted out by the Trump administration.
âThe bearish narrative can point to tariff rates,â the bank wrote. But, HSBC also said, Wall Street analysts have lowered expectations for corporate earnings to a level that most companies are likely to exceed. Therefore, it concluded, âWe have the perfect recipe for the broad-based melt-up in risk assets to continue.â
Melt-ups have long been part of the vocabulary of Edward Yardeni, the independent Wall Street economist and strategist. At the moment, he said, the market is âsort of, kind of, in a melt-up.â
Referring to the sharp stock downturn earlier this year, he added, âJust look at the way this correction has been reversed, itâs been a melt-up.â Stock valuations are âpretty rich,â he said, and people in the markets are âback to believingâ that artificial intelligence is âa miracle technology.â
In an email, he estimated a range of âsubjective probabilitiesâ for the stock market. There is a 60 percent chance that the bull market will continue, he said, a 25 percent chance of a bear market caused by a recession, and a third possibility: a 15 percent chance of a melt-up.
In a melt-up, stocks would spiral much higher, generating big gains on an unstable base.
The gains would be wonderful. But any provocation or disruption could set off a severe downturn.
## Donât Get Too Excited
âMarkets can remain irrational longer than you can remain solvent.â Thatâs an adage often attributed to the British economist John Maynard Keynes, though Iâve never found proof that he said it. Nevertheless, itâs apt. I worry about market melt-ups but rarely feel confident enough about my observations to do anything about it in my investing life.
Only occasionally, in my view, is it completely obvious that the market is so high that it must fall, or so low that it must rise. (Such moments are usually accompanied by a major shift in policy by the Federal Reserve â lowering interest rates sharply at the bottom of a bear market, or raising them when the economy is so red hot that it is on the verge of burning.) This isnât one of those times. In the second Trump administration, anything is possible for the stock market. It could rise, fall or, more likely, be extremely volatile and vacillate between extremes.
As a long-term investor using mainly diversified global index funds, I try to ride out the marketâs madness, using bonds and cash (much of it in money-market funds) to buffer me from severe stock downturns. Iâve bulked up that buffer this year.
While I take a long-term view, I would prefer a calmer ride. Who needs the agony of a stock market decline, even if you donât intend to touch the money for decades? More important, many people â including those in retirement or planning to start it soon â canât handle major downturns. And market crashes are often associated with recessions.
Melt-ups are much more pleasant than downturns but they cause major problems, too, because they are often followed by crashes.
It would be far better if markets were calm and orderly. So Iâm hoping we have neither a melt-up nor a meltdown now. A traditionally bumpy market, with setbacks but an upward arc, is in nearly everyoneâs interest. So donât get too excited if markets start to fly toward the sky.
**More Strategies Columns by Jeff Sommer**
[![]()The Outlook for the Economy Has Improved. And Yet. Aug. 18, 2023](https://www.nytimes.com/2023/08/18/business/the-outlook-for-the-economy-has-improved-and-yet.html)
[Jeff Sommer](https://www.nytimes.com/by/jeff-sommer) writes [Strategies](https://www.nytimes.com/column/business-strategies), a weekly column on markets, finance and the economy.
A version of this article appears in print on July 13, 2025, Section BU, Page 3 of the New York edition with the headline: The Increasing Danger of a Market Melt-Up. [Order Reprints](https://nytimes.wrightsmedia.com/) \| [Todayâs Paper](https://www.nytimes.com/section/todayspaper) \| [Subscribe](https://www.nytimes.com/subscriptions/Multiproduct/lp8HYKU.html?campaignId=48JQY)
See more on: [Edward Yardeni](https://www.nytimes.com/topic/edward-yardeni), [U.S. Politics](https://www.nytimes.com/section/politics), [Donald Trump](https://www.nytimes.com/spotlight/donald-trump)
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Strategies
Traders have repeatedly shrugged off President Trumpâs disruptive tariff wars and fiscal policy, pushing U.S. stock prices back into expensive territory, our columnist says.

Credit...Giulio Bonasera
Published July 11, 2025Updated July 12, 2025
Market meltdowns have been a big worry lately, and for good reason. With President Trump imposing the highest tariffs since the Great Depression and enacting myriad other disruptive policies, the threat of another market crash canât be ignored.
Yet despite an 18.9 percent downturn in the S\&P 500 earlier this year, the stock market has [rebounded](https://www.nytimes.com/2025/07/04/business/markets-investment-returns-trump.html). It has continually shrugged off shocks that, in previous years, may have set off a prolonged bear market.
In fact, stocks have become expensive again. While the potential for a serious market downturn hasnât vanished, I think itâs also time to begin thinking about another problem: the danger of a market melt-up.
By many measures, weâre already in perilously overvalued territory. On a historical basis, share prices are high in relation to corporate earnings, assets and the size of the overall economy.
I donât want to go too far with this. The U.S. stock market isnât nearly as expensive as it was at the height of the dot-com bubble in the late 1990s and early 2000. But it is increasingly pricey â surprisingly so, when you consider the repeated blows to market sentiment dealt by the Trump administration.
Tariffs re-emerged as a major issue over the past week. The administration issued an array of announcements: Tariffs will increase, be delayed, not be delayed, be imposed on copper, be negotiated lower, be made permanent, and on and on. Who really knows? The stock market has been absorbing this information, stumbling from time to time but then regaining its footing. While the economic impact of the tariffs has barely been felt yet, the stock market remains much higher than it was at the beginning of the year.
## How High?
One sign that the âmarket is a little out over its skis,â as Bespoke Investment Group put it in a note to clients this past week, is that shares of companies that are making no profit have been rising faster than those that are deeply profitable. Bespoke, an independent financial research firm, said, âFor stocks that are losing money, generally speaking, the bigger the losses the better the returns.â
Companies with marvelous narratives about future returns are capturing investorsâ imaginations. For example, a leading stock in the Russell 3000 index, with a gain of more than 500 percent this year, was Aeva Technologies. It makes sensors for robots, autonomous vehicles and drones â all hot items these days. Yet the company is losing a ton of money.
No matter. In the current market, the sky is the limit. Referring to the astonishing stock performance of money-losing companies, Bespoke said: âThis is, to put it mildly, an unsustainable dynamic. Valuations can only do so much to support markets before the trend reverses. Of course, there are other sources of market return other than multiple expansion of no-earnings companies, but this dynamic is still emblematic of a market that is starting to get carried away with itself.â
Moneymaking companies are receiving remarkably high valuations, too. Take Nvidia, which this past week became the first company to pierce the \$4 trillion threshold for stock market capitalization. Nvidia is highly profitable, and it designs many of the advanced chips that power artificial intelligence Nothing seems to be more prized than A.I. in the market right now.
Nvidia stock is extremely expensive: Its price-to-earnings ratio is above 50:1, according to FactSet. That means that an investor must pay more than \$50 for every \$1 of the companyâs earnings. Compared with the start of 2023, when its price was 250 times its earnings, the company may look like a bargain. Even so, its current valuation implies that its profits will grow at lightning speed for decades to come. The market may be comfortable with that assumption, but the law of gravity makes me [question](https://www.nytimes.com/2024/02/22/business/nvidia-price-to-sales-ratio.html) whether Nvidiaâs price is sustainable.
## Booms and Busts
Steep market valuations alone donât cause price declines, but in the past, they have eventually led to trouble. [Alan Greenspan](https://www.nytimes.com/1996/12/07/business/a-buried-message-loudly-heard.html), the former Federal Reserve chairman, warned elliptically of excessively high stock prices in December 1996, when he famously asked, âHow do we know when irrational exuberance has unduly escalated asset values, which then become subject to unexpected and prolonged contractions?â
He didnât provide a clear answer. In response to Mr. Greenspanâs words, the market foundered but then shot up further. It wasnât until March 2000 that stock prices â by then wildly exorbitant by most measures â ultimately crashed.
Irrational exuberance has become standard Wall Street jargon. Robert Shiller, the Yale economist and Nobel laureate, [used](https://press.princeton.edu/books/paperback/9780691173122/irrational-exuberance?srsltid=AfmBOoop4cdds5pTYCjZoeZwEBPTSblz78gRz9daZZG9upWXPw5FaRCK) the phrase as the title for an important book.
Melt-up isnât as widely used, but it may be on the verge of becoming so.
âThe melt-up in risk assets continues,â HSBC, the global bank based in London, warned recently.
It saw two distinct possibilities: an intensifying melt-up reflecting investor exuberance or a meltdown in the face of what could turn out to be endlessly troubling developments, many of them meted out by the Trump administration.
âThe bearish narrative can point to tariff rates,â the bank wrote. But, HSBC also said, Wall Street analysts have lowered expectations for corporate earnings to a level that most companies are likely to exceed. Therefore, it concluded, âWe have the perfect recipe for the broad-based melt-up in risk assets to continue.â
Melt-ups have long been part of the vocabulary of Edward Yardeni, the independent Wall Street economist and strategist. At the moment, he said, the market is âsort of, kind of, in a melt-up.â
Referring to the sharp stock downturn earlier this year, he added, âJust look at the way this correction has been reversed, itâs been a melt-up.â Stock valuations are âpretty rich,â he said, and people in the markets are âback to believingâ that artificial intelligence is âa miracle technology.â
In an email, he estimated a range of âsubjective probabilitiesâ for the stock market. There is a 60 percent chance that the bull market will continue, he said, a 25 percent chance of a bear market caused by a recession, and a third possibility: a 15 percent chance of a melt-up.
In a melt-up, stocks would spiral much higher, generating big gains on an unstable base.
The gains would be wonderful. But any provocation or disruption could set off a severe downturn.
## Donât Get Too Excited
âMarkets can remain irrational longer than you can remain solvent.â Thatâs an adage often attributed to the British economist John Maynard Keynes, though Iâve never found proof that he said it. Nevertheless, itâs apt. I worry about market melt-ups but rarely feel confident enough about my observations to do anything about it in my investing life.
Only occasionally, in my view, is it completely obvious that the market is so high that it must fall, or so low that it must rise. (Such moments are usually accompanied by a major shift in policy by the Federal Reserve â lowering interest rates sharply at the bottom of a bear market, or raising them when the economy is so red hot that it is on the verge of burning.) This isnât one of those times. In the second Trump administration, anything is possible for the stock market. It could rise, fall or, more likely, be extremely volatile and vacillate between extremes.
As a long-term investor using mainly diversified global index funds, I try to ride out the marketâs madness, using bonds and cash (much of it in money-market funds) to buffer me from severe stock downturns. Iâve bulked up that buffer this year.
While I take a long-term view, I would prefer a calmer ride. Who needs the agony of a stock market decline, even if you donât intend to touch the money for decades? More important, many people â including those in retirement or planning to start it soon â canât handle major downturns. And market crashes are often associated with recessions.
Melt-ups are much more pleasant than downturns but they cause major problems, too, because they are often followed by crashes.
It would be far better if markets were calm and orderly. So Iâm hoping we have neither a melt-up nor a meltdown now. A traditionally bumpy market, with setbacks but an upward arc, is in nearly everyoneâs interest. So donât get too excited if markets start to fly toward the sky.
A version of this article appears in print on July 13, 2025, Section BU, Page 3 of the New York edition with the headline: The Increasing Danger of a Market Melt-Up. [Order Reprints](https://nytimes.wrightsmedia.com/) \| [Todayâs Paper](https://www.nytimes.com/section/todayspaper) \| [Subscribe](https://www.nytimes.com/subscriptions/Multiproduct/lp8HYKU.html?campaignId=48JQY)
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