The sudden sell off in Japanese equities and a surge in the VIX suggest the current rout is being exaggerated by trend chasers
4 min
The red numbers in your 401(k) today might appear to vindicate warnings about an artificial-intelligence bubble and infirm economy. But don’t tilt your portfolio toward full pessimism just yet.
The S&P 500 was down 3% Monday, with the Nasdaq falling even further. Investors have been selling the year’s best performers, concerned that disappointing second-quarter results from big technology companies such as Alphabet , Tesla and Intel are a sign that the AI frenzy is a fad. Also, consumer discretionary stocks have become the worst-performing sector in the S&P 500, as lacklustre labour-market reports have raised worries that the Federal Reserve made a mistake by waiting until September to cut interest rates.
Overseas, the Stoxx Europe 600 closed almost 5% below where it was a week ago, whereas the Swiss franc, a common haven asset, is up roughly 4%. The most eye-popping moves happened in Asia, though, where the Nikkei 225 plunged 12.4% Monday in the worst trading session since Oct. 20, 1987—the day that followed Wall Street’s infamous Black Monday.
Yet it is precisely the breakneck speed with which Japanese equities tumbled that should give most investors a reason to remain calm.
As a guideline, sudden market selloffs are less dangerous than those that unfold progressively over time. This is because investors who rationally price in bad economic data often do so slowly, as it trickles in. Flash crashes, conversely, are often a sign that some tidbit of bad news made speculative bets go awry, triggering a cascade of trades, many of them automated.
Japan is particularly prone to such reversals because interest rates there are so low that many investors use them to fund higher-yielding investments in other currencies. Whenever markets get jittery, these “carry trades” tend to unravel, pushing up the yen and hitting Japanese stocks, many of which are diversified exporters that do better when global growth accelerates. Amplifying this tendency, Japanese stocks had this year become extremely popular among global investors.
The timing of the rout also points a finger at the Bank of Japan , which last week decided to tighten monetary policy for the first time in 17 years with the explicit goal of boosting the yen. Investors who rushed to cover their bets then triggered the reversal of stretched trades elsewhere, including in the U.S.
One of the most striking features of the S&P 500 for most of this year has been its extremely low volatility. Until July, the Cboe Volatility Index, or VIX, was at 2019 levels, and kept sliding lower even as investors made big changes to their monetary-policy forecasts.
While the VIX is often dubbed Wall Street’s “fear gauge,” the options contracts it is based on often themselves influence volatility. Whenever investors make bets against market swings, as they have recently in the U.S. by buying lots of structured products , the banks that sell those options are forced to take the other side. These hedges then suppress volatility in the stock market.
The flip side is that whenever a panic breaks through this feedback loop, volatility skyrockets. As the stock market opened Monday, the VIX hovered above 50, making it the highest weekly jump since the onset of the pandemic, though it later fell below 40.
This suggests the selloff is disproportionate, especially looking at the historical record: 87% of the time, investors who bought the S&P 500 on days when the VIX closed at 30 or higher ended up making money a year later.
The second-quarter reporting season has brought mostly good news, with 78% of the S&P 500 firms that have reported so far beating analysts’ earnings estimates—compared with a 74% 10-year average. Both AI-related companies and the rest are reporting net income above what was forecast a month ago. Overall, the U.S. economy still looks robust: The unemployment rate has gone up because the labor force has expanded.
Also, looking at S&P 500 returns since 1994 shows that selling based on the previous day’s falls is a bad strategy. Electing to move into cash after large monthly declines fared better, but still less well than sitting tight.
This isn’t to say that concerns about an economic slowdown or high tech valuations aren’t warranted. Investors have reasons to diversify away from the AI trend or swap more cyclically exposed stocks for more “defensive” names. Indeed, selling out of stocks after particularly exuberant days and months has historically tended to be a winning move. But hindsight is a terrible guide to investing your savings.
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Investors are bracing for a bumpier fall stock market due to shifting odds of a Federal Reserve interest-rate increase and other macro challenges.
3 min
The stock market had a decent summer. Investors are bracing for a bumpier fall.
In the past couple of months, equity investors cheered soaring profits at big companies, shrugged off jitters in the bond market and nudged megacap tech shares back near records.
Now, as the post-Labor Day stretch begins, a number of new challenges lie ahead: ever-shifting odds of an interest-rate increase from the Federal Reserve. Sky-high expectations after a stunning earnings season. The persistent threat of higher consumer prices as fighting in the Middle East drags on.
“You’re moving from this earnings-driven market to this macro-driven market with the Fed, inflation and interest rates in focus,” said Keith Lerner, chief investment adviser for Truist Advisory Services. “It tends to be a choppier period.”
Historically, every major U.S. stock index experiences its worst average return in September. The Dow Jones Industrial Average has slid an average 1.1% in the ninth month of the year, in data that dates back to the 19th century. The S&P 500 has seen the same average decline—and for every September dating back to 1928, the benchmark ends the month lower more than half of the time.
Analysts caution against reading too much into those seasonal patterns. But in recent weeks, new reasons for investor caution have emerged. One of the largest: the looming threat of an interest-rate increase from the Fed, which announces its next policy decision on Sept. 16.
Chairman Kevin Warsh’s decision to ditch forward guidance and take more of his cues from markets has muddied the waters for investors when it comes to monetary policy. That has left traders scouring Fed governor speeches and economic-data reports for clues on the central bank’s next move.
“There’s going to be a lot of eyes on those numbers,” said John Luke Tyner, head of fixed income and portfolio manager at Aptus Capital Advisors.
The past couple of weeks offered just one example of how frequently those expectations can change. After Warsh struck a hawkish tone during remarks on Aug. 28, the odds of a hike at the Fed’s next meeting jumped from 35% before the speech to 58%, according to CME FedWatch data.
On Thursday, Fed governor Christopher Waller made a case for leaving rates where they are. Interest-rate futures showed coin-flip odds between a hike and a hold. Then Friday’s robust jobs report amped up rate-hike bets once more, back to a roughly 60% chance of higher rates after the meeting.
“Rates have really been driving the car for equities the last few weeks,” said Ross Mayfield, an investment strategist at Baird.
That uncertainty comes as an unruly bond market could put pressure on stocks. Treasury yields have marched higher for much of the summer, driven by concerns about rising oil prices, growing U.S. budget deficits and a deluge of tech-company bonds now competing for investors’ cash. Last week, the rout went global, pushing yields to multiyear highs in Japan, Germany and the U.K.
Higher bond yields can drag on stock prices and lift borrowing costs for companies and consumers across the economy.
Rising prices remain the top concern for bond traders, and continued fighting between the U.S. and Iran has done little to ease those worries. The national average price of diesel climbed to a record of $5.850 on Friday, according to AAA. That is up from $3.712 a year ago.
Investors will get more insight on the path of prices this week, with the much-awaited consumer-price index report due Friday and a reading on producer prices Thursday.
With another blockbuster earnings season in the books, some analysts have also warned that any boost from the third-quarter reports due in the coming months could be minimal. Back-to-back quarters of standout profits have raised expectations and made it especially difficult to impress traders. Custom-chip company Broadcom, for example, said Wednesday that it more than tripled its earnings and nearly doubled its revenue. Shares slipped 2.7% the next session.
Many analysts note there are plenty of reasons not to panic. The economy is in impressive shape, thanks to a healthy labor market and the rippling effects of the artificial-intelligence investment boom. Profits are booming at America’s biggest companies. The Cboe Volatility Index has dropped to its lowest levels of 2026. Credit spreads are tight, a sign bond investors aren’t concerned about economic conditions that could hurt companies.
But the mood has shifted from the euphoria that felt tangible when the Nasdaq was notching back-to-back records early this summer. The question, Mayfield said, is whether the fundamentals that have bolstered the bull market so far can stretch the rally into 2027.
“There are more anxieties or uncertainties about the backdrop,” he said. “It does feel like a transitional moment.”
