Stocks tumble in worst day since May, as tech shares slide and bond yields climb.

Investors, weighing the prospect of the Federal Reserve preparing to reduce its purchases of government debt, sold off bonds, pushing the 10-year’s yield to its highest level since June.

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The prospect of the Federal Reserve not reaching as deep into its bottomless pockets is starting to hit home for investors.

The S&P 500 tumbled 2 percent on Tuesday — the worst one-day slide for the benchmark U.S. index since May — as investors faced the expected wind-down of the enormous bond purchases the central bank has made since the start of the pandemic.

“The deep sell-off highlights the extent of the nerves in the markets surrounding the moves of the Fed,” said Fiona Cincotta, senior financial markets analyst at Forex.com.

The coming slowdown of bond purchases is a sign of the Fed’s confidence that the economy is recovering from the upheaval of the pandemic. But, Ms. Cincotta noted, other factors are still making Wall Street wary.

“There’s also a combination of rising energy prices, concerns that inflation could be more entrenched in these elevated levels and the fact that consumer confidence is slowing,” she said.

The trigger for Tuesday’s tumble, which cut across sectors, was a rise in the yield on the benchmark 10-year Treasury note. With the Fed preparing to slow its purchases as soon as November, investors have been selling off bonds before demand ebbs. On Tuesday, that pushed the 10-year’s yield up to about 1.54 percent, its highest level since June.

Even though the Fed has said it doesn’t plan to increase interest rates for months or years, government bond yields are the basis for borrowing costs across the economy. When bond prices fall, yields rise — a move that can hinder the stock market’s performance because it makes owning bonds more attractive and can discourage riskier investments.

Tech stocks, which are particularly sensitive to the prospect of higher interest rates, were hit hard on Tuesday. The tech-heavy Nasdaq composite fell 2.8 percent, its biggest drop since February.

Higher rates would make borrowing more expensive for smaller companies, and the jump in yields was a blow to shares of several high-flying stocks. Etsy, the online craft marketplace, dropped 6 percent, and Shopify fell more than 5 percent. Both companies have soared during the pandemic.

“With tech stocks, you’re betting for a company to have a breakthrough years from now,” said Beth Ann Bovino, the chief U.S. economist at S&P Global. “If interest rates go up today, that value that you receive years from now is discounted.”

The biggest technology stocks — particularly Amazon, Apple, Microsoft, Google and Facebook — have a vast pull on the broader market and helped drag down the S&P 500. Apple fell 2.4 percent and was the best performer of the tech giants. Amazon dropped 2.6 percent while Microsoft, Facebook and Google were down by more than 3.5 percent.

The delta variant of the virus remains a concern for investors, while persistent supply-chain bottlenecks have affected everything from auto production to school lunches. In Washington, lawmakers remain deeply divided over spending on infrastructure and expanding social programs.

And another pressing fight is brewing over raising the nation’s debt limit — a dispute that could trigger a government shutdown. Treasury Secretary Janet L. Yellen warned lawmakers on Tuesday of “catastrophic” consequences if Congress does not deal with the debt limit before Oct. 18.

The unease is apparent in stock performance the past four weeks. The S&P 500 is approaching a 4 percent drop for September, ending seven straight months of gains. The winning streak had lifted stocks more than 20 percent, as investors seemed to largely shrug off any bad news.

Bumpy moments have usually involved the Fed. Tuesday’s trading echoed the volatility of earlier this year, when a jump in rates roiled financial markets. That rise happened as traders worried that higher inflation might cause the Fed to increase rates sooner than officials had forecast.

“There’s no doubt that the equity market does not like higher rates — there’s just no debate about it,” Ralph Axel, director of U.S. Rates Strategy at Bank of America.

Lauren Goodwin, an economist at New York Life Investments, wrote in a note to clients that investors have begun seeking out safer investments while weighing concerns including the debt-ceiling fight and regulatory actions in China.

The Chinese government has shown signs of sharply shifting away from the policies that have guided its economy for much of the last decade, tightening regulation on subjects like online gaming and data sharing by tech companies. And Beijing has so far been reluctant to bail out the teetering Evergrande Group, a beleaguered residential developer with $300 billion in debt, another shift from typical policy.

But, Ms. Goodwin wrote, risks like that “should do little to impact the broader fundamental environment.” Instead, she said, the forces driving the market in the near future would remain those that have done so throughout the past 18 months: the spread of the virus, government spending, and decisions by the Federal Reserve.

“The path will depend heavily on our three highly uncertain drivers — the pandemic, monetary policy and fiscal policy,” she wrote.

While the slowdown of bond-buying will start sooner rather than later, the Fed’s main policy interest rate — its more powerful and traditional tool — remains near zero. And the Fed chair, Jerome H. Powell, and his colleagues have signaled that the central bank is a long way from raising interest rates because it wants to see the job market return to full strength before doing so.

“The test for raising interest rates is substantially higher,” Mr. Powell said at a Senate Banking Committee hearing on Tuesday. What the Fed wants to see, he said, is a “very strong” labor market: “The kind of thing that we did see before the pandemic arrived.”

Jeanna Smialek and Matt Phillips contributed reporting.

Brent crude, the international oil benchmark, touched $80 a barrel on Tuesday for the first time in nearly three years amid growing signs of an energy crunch.

Oil prices have leapt by about a quarter over the last month as fears of a looming tight market have overcome concerns about the Delta variant of the coronavirus slowing the global economic recovery. Soaring prices for natural gas are also influencing the oil market, analysts say, as some industrial users of gas switch to oil and other fuels.

This may be the first time that “gas impacts oil and not the other way around,” said Carlos Torres Diaz, head of gas and power at Rystad Energy, a consulting firm.

Brent crude rose as high as $80.70 a barrel on Tuesday, before falling back to $78.94..

Analysts say outages caused by Hurricane Ida, which damaged oil platforms and infrastructure in the Gulf of Mexico in late August, have outweighed the modest increases in output agreed by the Organization of the Petroleum Exporting Countries in July.

OPEC and its allies including Russia are likely to come under pressure to speed up their plans for supply increases when the group meets by teleconference on Monday. The Biden administration has already criticized the group for not doing enough to cushion price increases.

The long lines at gas stations in Britain, while caused by shortages of fuel truck drivers rather than oil, may also be adding upward pressure to prices.

Analysts at Goldman Sachs recently forecast that Brent would hit a peak of $90 a barrel in December, noting that global inventories are being burned off at what they described as a record rate.

“The current global oil supply-demand deficit is larger than we expected,” they wrote.

At the same time, the analysts said, successful coronavirus vaccine programs are “leading more countries to reopen, including to international travel.”

Aviation fuel has been the key laggard in the global recovery of oil demand, so a pickup in air travel would be an important factor in bolstering the market.

Senator Elizabeth Warren, Democrat of Massachusetts, and Jerome H. Powell, the chair of the Federal Reserve, on Tuesday. Ms. Warren later suggested that Mr. Powell would “drive this economy over a financial cliff.”Credit…Pool photo by Kevin Dietsch

Senator Elizabeth Warren, Democrat of Massachusetts, blasted the Federal Reserve chair, Jerome H. Powell, for his financial regulation track record and said that she would not support him if the White House renominated him, calling him a “dangerous man to head up the Fed.”

Mr. Powell’s term as head of the central bank ends in early 2022, and the Biden administration is considering whether to reappoint him. Mr. Powell, a Republican, was nominated to the Fed’s Board of Governors by former President Barack Obama and elevated to chair by former President Donald J. Trump.

While some prominent Democratic economists and advocacy groups support Mr. Powell, who has been intensely focused on the labor market during his term as Fed chair, some progressives openly oppose him. They often cite his track record on financial regulation — as Ms. Warren did to his face on Tuesday, as he testified before the Senate Banking Committee.

“The elephant in the room is whether you’re going to be renominated,” Ms. Warren said, looking down at the Fed chair during the hearing. “Renominating you means gambling that, for the next five years, a Republican majority at the Federal Reserve, with a Republican chair who has regularly voted to deregulate Wall Street, won’t drive this economy over a financial cliff again.”

Ms. Warren, and those who agree with her, have worried that leaving Mr. Powell in place will prevent the Fed from taking a tougher stance on financial regulation. Mr. Powell has said that when it comes to regulatory matters, he defers to the Fed’s vice chair for supervision, noting that Congress created that job to lead up bank oversight following the 2008 financial crisis.

“I respect that that’s the person who will set the regulatory agenda going forward,” Mr. Powell said during a news conference last week. “And furthermore, it’s fully appropriate to look for a new person to come in and look at the current state of regulation and supervision and suggest appropriate changes.”

Ms. Warren’s colleague Senator Michael Rounds, a Republican from South Dakota, followed her scathing comments by saying that Mr. Powell deserved to be renominated, and that he looked forward to working him for the next several years.

The White House has so far given little indication of whom it will pick to lead the central bank.

President Biden already has the opportunity to fill one open governor position at the Fed, and several other roles will soon become available: The governor seat of the Fed’s vice chair, Richard Clarida, will expire in the coming months, as will Randal K. Quarles’s position as vice chair for supervision. The openings could give the administration a chance to remake the central bank from the top with its nominations, who must pass Senate confirmation.

Other lawmakers at the Senate hearing pushed Mr. Powell to focus on improving diversity at the central bank — highlighting another key concern among Democrats as the leadership shuffle gets underway.

Senator Sherrod Brown, a Democrat from Ohio and the head of the Senate Banking Committee, pointed out that there had never been a Black woman on the Federal Reserve’s Board of Governors in Washington, while also referring to reporting from earlier this year that showed a dearth of Black economists at the central bank.

He asked if Mr. Powell believed that the central bank should have a Black woman on its Board of Governors.

“I would strongly agree that we want everyone’s voice heard around the table, and that would of course include Black women,” Mr. Powell said. “We of course have no role in the selection process, but we would certainly welcome it.”

Lisa Cook, a Michigan State University economist, and William Spriggs, chief economist of the labor union AFL-CIO, are often raised as possible candidates for governor positions or leadership roles. Both are Black. Lael Brainard, a white woman who is currently a Fed governor, is frequently raised as a possible replacement for Mr. Powell if he is not renominated, and Sarah Bloom Raskin, a white woman who is a former top Fed and Treasury official, is often suggested as a replacement for Mr. Quarles.

Mr. Powell, as he noted, has no formal role in selecting his future colleagues at the Fed Board.

He and his colleagues at the Fed Board will, however, have a chance to weigh in on who will take over two newly open positions around the Fed’s decision-making table. The central bank has 19 total officials at full strength, seven governors and 12 regional bank presidents.

Robert S. Kaplan, the Dallas Fed president, and Eric S. Rosengren, the Boston Fed president, both announced their imminent retirements on Monday, amid widespread criticism of the fact that they were trading securities in 2020 — during a year in which the Fed unrolled a widespread market rescue in response to the pandemic.

Mr. Powell addressed that scandal on Tuesday, pledging to lawmakers that the Fed would change its ethics rules and saying that the Fed was looking into the trading activity to make sure it was in compliance with those rules and with the law.

“Our need to sustain the public’s trust is the essence of our work,” Mr. Powell said, adding that “we will rise to this moment.”

Beyond grabbing headlines, the departures will leave two regional bank jobs available at the Fed. The regional branches’ boards, except for bank-tied members, will search for and select replacement presidents. The Fed’s governors in Washington have a “yes” or “no” vote on the pick.

The Fed has never had a Black woman as a regional bank president, either. Raphael Bostic, president of the Federal Reserve Bank of Atlanta, is the first Black man to serve in one of those roles.

At the Board of Governors, Mr. Quarles’s leadership term ends most imminently, on Oct. 13. His position as governor does not expire until 2032, and he has signaled that he will likely stay on as a Fed governor at least through the end of his leadership term at the Financial Stability Board, a global oversight body, in December. Mr. Powell’s leadership term ends in early 2022, though he could stay on as governor since his term in that role does not expire until 2028. Mr. Clarida will have to leave early next year unless he is reappointed.

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Treasury Secretary Janet L. Yellen warned lawmakers that if Congress did not raise or suspend the statutory debt limit by Oct. 18, the country would default for the first time in history, triggering a “self-inflicted” financial crisis.CreditCredit…Stefani Reynolds for The New York Times

Treasury Secretary Janet L. Yellen on Tuesday warned lawmakers of “catastrophic” consequences if Congress failed to soon raise or suspend the statutory debt limit, saying inaction could lead to a self-inflicted economic recession and a financial crisis.

At a Senate Banking Committee hearing where she testified alongside the Federal Reserve chair, Jerome H. Powell, Ms. Yellen laid out in explicit terms what she expects to happen if Congress does not deal with the debt limit before Oct. 18, which Treasury now believes is when the United States will actually face default.

Seniors could see their Social Security payments delayed, soldiers would not know when their paychecks were coming and interest rates on credit cards, car loans and mortgages would rise, making payments more costly, she warned. She also suggested that a default would jeopardize the dollar’s status as the international reserve currency, which Democrats argue would be a gift to China.

“It would be disastrous for the American economy, for global financial markets, and for millions of families and workers whose financial security would be jeopardized by delayed payments,” Ms. Yellen said.

Ms. Yellen and Mr. Powell, America’s two top economic policymakers, also warned lawmakers on Tuesday that the Delta variant of the coronavirus had slowed the economic recovery, but they said the economy was continuing to strengthen.

Their testimony comes at a critical moment in the economic recovery. Businesses are facing labor shortages and consumers are coping with rising prices amid a resurgent pandemic. Congress is also grappling with a thicket of legislative challenges in the coming days, all of which could have an impact on the economy.

Those challenges include the need to extend federal funding to avoid a U.S. government shutdown; raising the debt limit to prevent defaulting on the nation’s financial obligations; and passing President Biden’s infrastructure and social safety net packages.

In a letter to Congress ahead of the hearing and in her opening remarks, Ms. Yellen said that Treasury is likely to exhaust the “extraordinary measures” she has been employing to delay a default if Congress has not acted by Oct. 18.

“At that point, we expect Treasury would be left with very limited resources that would be depleted quickly,” she wrote. “It is uncertain whether we could continue to meet all the nation’s commitments after that date.”

For weeks, Ms. Yellen has been quietly pressing lawmakers to put politics aside and ensure that the United States can continue to meet its fiscal obligations. She has been in touch with Wall Street chief executives and former Treasury secretaries as she looks to keep markets calm and find allies who can help her make the case to recalcitrant Republicans, who believe Democrats must deal with the debt limit on their own.

“It is imperative that Congress swiftly addresses the debt limit,” Ms. Yellen said. “The full faith and credit of the United States would be impaired, and our country would likely face a financial crisis and economic recession.”

The debt limit is traditionally addressed on a bipartisan basis, but Republicans are refusing to join Democrats in passing legislation to lift the borrowing cap. Republicans argue that Democrats have the votes to lift the debt limit on their own and that they should do so. Democrats argue that Republicans are playing a dangerous political game.

In a tense exchange with Senator John Kennedy, Republican from Louisiana, Ms. Yellen said it was possible that Democrats could lift the debt limit on their own but that Republicans were shirking their responsibility by refusing to cover debts they helped incur.

“It is very important to recognize that raising the debt ceiling is about paying bills that Congress has incurred in the past,” Ms. Yellen said, noting that deficits have been run under Democratic and Republican administrations “It’s a shared responsibility.”

Mr. Kennedy, who was unconvinced, said that Democrats just wanted to tie Republicans to their big spending plans and that a crisis could be averted by Democrats.

“Easy, peasy. Finished. Let’s go have a cocktail,” Mr. Kennedy told Ms. Yellen.

Ms. Yellen also told lawmakers that the economy, while strengthening, is still in a “fragile” state.

“While our economy continues to expand and recapture a substantial share of the jobs lost during 2020, significant challenges from the Delta variant continue to suppress the speed of the recovery and present substantial barriers to a vibrant economy,” Ms. Yellen said in her opening remarks. “Still, I remain optimistic about the medium-term trajectory of our economy, and I expect we will return to full employment next year.”

Ms. Yellen and Mr. Powell will testify again on Thursday before the House Financial Services Committee.

Amazon’s new Astro robot, which features a screen and cameras, has a starting price of $1,000.Credit…Amazon

“Customers don’t just want Alexa on wheels,” Dave Limp, the head of Amazon’s devices, said at a company event on Tuesday. Then he proceeded to introduce a technology-packed home robot that looked a lot like … Alexa on wheels.

At least four years in the making, the small robot, called Astro, has a large screen and cameras attached to a wheeled base that can navigate a home. It was part of the company’s annual devices event, where Amazon unveiled an array of products, including a smart thermostat, upgrades to its Echo lineup and a children’s device for interactive video messaging.

Of all the products it showed, Amazon was clearly most excited about Astro, which was shown as the finale. And from the start, the company tried to sort out the differences between Astro and Alexa, the company’s digital assistant. Amazon said Astro’s large eyes on the screen, and the different tones it emitted, helped give the machine a “unique persona.” (At a starting price of $1,000, Astro is also a lot more expensive than most Alexa-enabled devices.)

But the main uses Amazon presented seemed to mirror some of the abilities of its Alexa and related products, which already put voice and camera surveillance in different rooms of a house. It does move, though, and Mr. Limp said customers could send the robot to check on people and different pets — for example, raising a camera on a telescopic arm to see if the flame on a stove is still on.

“Or if you are doing a video call, Astro will move around with you in the house, so you can continue the conversation,” he said. In a demonstration video, a child crawled around on the floor at the height of the main camera as the robot followed it. The extendable arm can reach as high as 42 inches, meaning its camera would follow an adult roughly around the person’s midsection.

Mr. Limp said Amazon had built “an entirely new technology construct” for the device to navigate a home, with several technologists discussing the difficulty of locating and mapping the varied spaces in a house at the same time. Astro did not appear to be able to navigate stairs, though it stops before tumbling down them, like a Roomba.

The company said customers could request invitations to be part of its “Day 1 Editions” pilot programs, and that it would start granting them at some unspecified time this year.

“In one of the senior management meetings, we talked about ‘Does anybody in the room think that in five, 10 years, you’re not going to have robots in your home?'” Charlie Tritschler, an Amazon vice president, said in the presentation. “Everyone was like, ‘Yeah, we are.'”

Erin Griffith (@eringriffith) and Erin Woo (@erinkwoo), two of our tech reporters, are covering the trial of Elizabeth Holmes, who dropped out of Stanford University to create the blood testing start-up Theranos at age 19 and built it to a $9 billion valuation and herself into the world’s youngest self-made female billionaire — only to flame out in disgrace after Theranos’s technology was revealed to have problems.

Follow along here or on Twitter as she is tried on 12 counts of wire fraud and conspiracy to commit wire fraud. The trial is generally held Tuesdays, Wednesdays and Fridays.

Erin Woo

We’re going through what tests were offered during the friends and family launch. The only tests run through 9/28/13 were two that did not run on the Edison, Rosendorff confirms. The first Edison-based test, TSH, a measure of thyroid function, was run 10/17/2013.

Erin Woo

Wade also keeps having Rosendorff read his own testimony, silently, to himself. That’s happening again now.

Erin Woo

In the email, Balwani writes, “We feel confident we can handle ~30 samples/day from this location at this point. And it has been 2 months since we have been out in WAG [Walgreens]. It’s time to go live.” Wade now trying to make the point that they had not previously been live.

Erin Woo

Found it! We are now looking at an 11/7/13 email from Balwani to Rosendorff about opening their Palo Alto/Uni Ave location to the public on the coming Monday. It had previously only been open to friends/family.

Erin Woo

We are now, once again, trying to find the correct pages in the MANY binders the defense gave Rosendorff.

Coinbase’s initial public offering was advertised in Times Square in April. The company is one of many blockchain businesses aiming to offer services similar to those of traditional banks.Credit…Gabby Jones for The New York Times

The cryptocurrency exchange Coinbase announced on Monday that it would soon allow customers in the United States to deposit money from their paychecks directly into their crypto accounts.

Customers can keep that money in dollars or automatically convert it into Bitcoin or other cryptocurrencies. This means that users can “more easily make regular crypto trades,” Prakash Hariramani, Coinbase’s senior product director, wrote in a blog post.

Crypto companies are rapidly creating an alternative banking universe. Coinbase is one of many blockchain businesses aiming to offer services similar to those of traditional banks, like loans, savings accounts and debit and credit cards. Allowing direct deposits could make it easier for Coinbase customers to migrate their financial lives away from old-school financial institutions.

“Customers tell us that making frequent transfers is time-consuming and inconvenient,” Mr. Hariramani wrote.

The industry’s move into banking is causing alarm in Washington. Last week, Coinbase said that it would drop a proposed interest-generating product, called Lend, after the Securities and Exchange Commission threatened to sue because the service could violate securities laws. Notably, Lend would have been based on USD Coin, a stablecoin whose value is pegged to the dollar but was recently found not to be backed one-for-one with dollars, as claimed. U.S. financial regulators will soon issue a report on regulating the fast-growing stablecoin sector.

More regulation seems inevitable. Officials fear that crypto firms without the same reserve requirements and capital controls as traditional financial institutions will lure users with high yields and low fees without revealing the risks that come with these accounts. Big banks and their trade associations have also made that case, all while striking deals with the upstart competitors to get in on the action.

Christine Lagarde, the president of the European Central Bank, said the risk posed by supply bottlenecks could increase if problems in global shipping and other issues are not resolved.Credit…Kai Pfaffenbach/Reuters

It has been increasingly clear that shortages of semiconductors, raw materials and other goods are having a tangible effect on growth, but precisely how much was hard to gauge. On Tuesday, Christine Lagarde, the president of the European Central Bank, put a number on it.

Exports from the eurozone would have been almost 7 percent higher during the first six months of 2021 if not for supply bottlenecks, she said, citing analysis by central bank economists.

More than 40 percent of the eurozone’s gross domestic product is based on exports, so 7 percent of lost sales amounts to a substantial blow to overall growth. By comparison, exports account for only 12 percent of the U.S. economy.

“These risks to growth could mount if the pandemic continues to affect global shipping and cargo handling as well as key industries like semiconductors,” Ms. Lagarde said in a speech.

Ms. Lagarde also had some good news. After the steepest collapse on record, she said, the eurozone has bounced back more quickly than expected. Despite supply issues, economic output will exceed the prepandemic level by the end of this year, she said, nine months sooner than expected.

Two Federal Reserve officials embroiled in controversy for trading securities that could have benefited from the central bank’s 2020 intervention in financial markets announced on Monday that they would leave their positions.

Robert S. Kaplan, who heads the Federal Reserve Bank of Dallas, will retire on Oct. 8, according to a statement released Monday afternoon. Eric S. Rosengren, the president of the Boston Fed, will retire this Thursday, accelerating his planned retirement by nine months.

The resignations followed the Fed’s announcement earlier this month that the Fed chair, Jerome H. Powell, had ordered a review of the central bank’s ethics rules in light of the controversy surrounding the trades.

Creative Artists Agency announced Monday that it was buying its smaller rival ICM Partners for an undisclosed amount, the largest industry consolidation in more than a decade and one that could have significant ripple effects in the entertainment and sports worlds.

The agencies’ top executives — Bryan Lourd at CAA and Chris Silbermann at ICM — positioned the deal as a supercharging of the representation business and an opportunity for CAA to expand in both publishing and sports. ICM has a substantial books division and sports assets that include the recently acquired N.F.L. agency Select Sports Group and the London-based soccer agency Stellar Group.

The economy has begun to rebound from the coronavirus pandemic, but millions of people still haven’t returned to work. Some are looking but haven’t been able to find jobs. Others can’t work because of child care or other responsibilities. Still others say the pandemic led them to rethink how they prioritize their careers.

What is keeping you on the sidelines right now? How are you getting by financially without a steady paycheck? How has your time away from work changed your life, both now and in the future?

CreditCredit…Kiel Mutschelknaus

Today in the On Tech newsletter, Shira Ovide writes that Facebook may finally be paying the price for its bad reputation.

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