The quieter scenes at Times Square and other luxury department stores in Hong Kong paint a stark contrast to the fevered spending of recent years, when young, upwardly mobile Chinese seemed to have insatiable appetites for Chanel handbags and Hermès scarves.
After growing by double digits in the last decade, spending on luxury goods in China contracted for the first time last year to about $18 billion, shrinking 1 percent, according to the consultancy Bain & Company.
On top of the market turmoil, moves by the Chinese government to devalue the renminbi and concerns over further rounds of devaluation cast a new pall on the luxury marketplace.
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"This is going to hit hard," said David Friedman, the president of Wealth-X, a luxury intelligence firm. Mr. Friedman, who is based in New York, added, "It's the straw that breaks the camel's back for luxury brands that looked at the Chinese consumer as a driver of their revenue growth."
"Is the Chinese consumer still incredibly important to luxury brands? The answer is absolutely yes. But is the Chinese consumer over the next several years going to be the same economic juggernaut of consumption for these brands? The answer is no."
These jitters stem from how disproportionately global luxury brands have leaned on China for growth. Greater China drives as much as 25 percent of sales at Burberry, and 20 percent of sales at Prada, according to estimates by Exane BNP Paribas. The Swatch Group, whose brands include Omega, Harry Winston and Balmain, derives as much as 35 percent of its sales in mainland China, Hong Kong and Macau.
Those percentages would be even higher if they took account of all the luxury goods that Chinese tourists snap up overseas, where items are often cheaper than in Beijing or Shanghai, where shoppers must pay import duties. According to Bain, nearly half of Chinese luxury spending occurs outside China.
A weaker renminbi would make it more expensive for Chinese consumers not just to buy foreign luxury products in China, but also to travel overseas to cities like New York or Milan to buy luxury goods. A shakier economy and market turmoil back home would damp travel, as well as demand.
"Things are becoming more expensive, people are traveling less, and market turmoil is causing people to retrench and think about their luxury spending," said Simeon Siegel, a senior equity analyst in specialty retailing and luxury for Nomura Securities. "So you walk down Fifth Avenue, and you see emptier stores."
Still, it is important to keep the effects of the market rout and devaluation in perspective, said Luca Solca, head of global luxury goods at Exane BNP Paribas. According to simulations run by Mr. Solca, a 5 percent devaluation of the renminbi would push sales down less than 1 percent at most global luxury brands he tracks, including Burberry, Hermès, Prada, Louis Vuitton and the Swatch Group.
Even a 20 percent devaluation of the renminbi would hardly make a dent of 5 percent in those companies' sales, according to Mr. Solca's calculations.
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"It is often the case that markets react harshly to major surprises, a sort of 'Shoot first, ask questions later' approach," Mr. Solca said. "This looks like financial turmoil, not turmoil in the real economy. If it continues to grow, though, it will at one point have an impact on the real world, too."
Zhou Ting, director of the Fortune Character Institute, a research firm based in Shanghai that publishes the annual China Luxury Report, said she expected Chinese luxury tourism to continue despite the market uncertainties and the renminbi's drop in value.
Chinese travelers are drawn overseas partly by a hunt for value, she explained. Because of high tariffs, a Furla luxury handbag her firm examined recently cost $310, or 1,980 renminbi, with the steepest discounts available in China, but it sells for just a third of that price at the Leonardo da Vinci airport in Rome.
"The new yuan depreciation is not nearly enough to deter the very strong urge of Chinese shoppers to buy luxury goods overseas," she said.
At the Tai Koo Li mall in central Beijing, a gleaming expanse of luxury retailers including Lanvin, Versace and Vera Wang, several shoppers shrugged off the recent currency moves.
Xu Zijin, 19, a sophomore at a university in California, said she normally bought luxury goods in the United States because "the price is always very high in China," and she would continue to do so.
For some brands, like Coach, which manufactures a majority of its handbags in China, a weaker renminbi could even be a positive, Oliver Chen, a retail analyst at the Cowen Group, said in a recent report. Gross margins at Coach, for instance, would benefit from lower input costs — especially lower wages for Chinese workers — if currency rates remained at their current level, Mr. Chen said.
Andrea Shaw Resnick, head of investor relations and corporate communications at Coach, said it was still too early to project the impact of the weaker renminbi on sales trends.
Still, "we've been managing through exchange rate fluctuations for many years," Mr. Resnick said. "Importantly, our sourcing of both finished goods and raw materials in the region provides some degree of natural hedge," he said. "Of course, we'll continue to monitor the situation closely."
Ultimately, the future of Chinese luxury spending — and who is able to attract more of it — hinges on longer-term shifts in global currencies, as well as economic growth back home.
The eurozone and Japan have been bolstered by an influx of Chinese tourists, thanks to the weakness of their currencies, which have each fallen almost 10 percent against the renminbi over the last 12 months — even after the recent devaluation.
The dollar, on the other hand, has strengthened against major currencies over the last year, and it is up about 4 percent against the renminbi from 12 months ago, despite the recent devaluation. The strong dollar is weighing on tourist spending in the United States; Macy's recently blamed dwindling tourism dollars for lackluster earnings in the second quarter.
"The Europeans, the Chinese tourists, the Brazilian tourists around the world, they're just not coming to America," Macy's chief executive, Terry J. Lundgren, told CNBC last week. "And the strength of the dollar is impacting that."
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Mika Tsuruta, 25, an employee at the Japanese handbag brand Samantha Vega, sat smoking by an enormous robot outside the Times Square mall. She usually works in Tokyo but was sent to the retailer's Hong Kong store to train the staff in customer service.
During her time in Hong Kong, she has noticed Chinese customers looking for a less expensive alternative to the big-name luxury brands, she said. Samantha Vega fits the bill — a handbag from the Japanese retailer sells for about 2,200 Hong Kong dollars (around $280), a fraction of the 25,000 Hong Kong dollars (nearly $3,225) a Chanel flap bag can fetch.
"They say they are looking for something good, something cheaper," she said.
Leo, an 18-year-old student from Jiangsu, in eastern China, about to start university in Hong Kong, walked around another lavish shopping center, the Landmark. He took photos through the store window of S.T. Dupont, gawking at the gold-embellished pens and lighters on display, and at ads featuring members of the British royal family.
Leo, who wished to be identified only by his English name, insisted that the point of his trip to the mall was not to shop. The state of the economy and the currency devaluation worried his family, he said.
"It means I need to spend more money on my studies," he said. "We don't want to buy too much."