Chinese stocks have exploded upward as the government unveiled economic stimulus measures over the past week.

The market has seen record trading volume, and the benchmark CSI 300 Index has skyrocketed 25% since Sept. 23 to 4,018. To be sure, that’s still more than 30% below its February 2021 record.

Among popular U.S.-listed Chinese stocks, Alibaba  (BABA) , the world’s largest e-commerce company, has jumped 25% since Sept. 23. And Yum China,  (YUMC)  the country’s largest restaurant chain, has climbed 30%.

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As for the bazooka-style stimulus, the central bank announced a series of interest-rate cuts, reduced bank-reserve requirements and a program to fund stock purchases by institutional investors. In addition, the government pledged to increase spending, though it was short on specifics.

China’s stocks have soared over the past week, but will the surge continue?

Jie Zhao/Getty Images

On the housing front, the latest leap came after three of China’s biggest cities loosened regulations for home purchases, and the central bank moved to lower mortgage rates. Residential real estate is a key — and struggling — industry for the nation of 1.4 billion.

The Chinese stock market has slumped over the past three years as the economy weakened.

China’s economic growth is sluggish

GDP grew an annualized 4.7% in the second quarter, the weakest in more than a year and below the government’s target of 5%. (Experts say China’s government likely exaggerates growth figures in any case.)

Stronger economic expansion could be a boon for the stock market, boosting corporate earnings. Many investors in China bubbled over with optimism after the government’s moves.

“It’s really a big turnaround; the policies are so intensive. We have never seen such clear instruction to stop housing prices declining and support the stock market,” Dickie Wong, executive director of research at Kingston Securities, told Reuters.

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“Many foreign investors are afraid of missing out. Local retail investors are asking me what they should add to. Institutional investors are rushing to the market to catch up.”

Even U.S. stocks received some support last week from the China news.

But not everyone is losing their mind over the government stimulus package. China has announced similar moves before without much impact.

Until the real estate market recovers and middle-class consumers have enough income and confidence to spend it, the economy will remain in the doldrums, many experts say.

Veteran fund manager is skeptical of China rally

Count TheStreet Pro columnist Ed Ponsi, managing director of Barchetta Capital Management, as one of the skeptics.

“While everyone else is dancing, I hate to be the guy in the corner with a thought bubble that reads, ‘They don’t know that none of this is real,’” he wrote.

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“That’s the problem. It’s not real. China’s bazooka is nothing but smoke and mirrors. With its decision to prop up the stock market using government funds, China has taken a literal joke — ‘plunge protection team’ — and made it a reality.”

The plunge protection team was a nickname for the U.S. Working Group on Financial Markets. It was formed in 1988 to provide recommendations to the U.S. president during times of market stress.

Experts have doubts about stimulus

Already there are signs that China’s stimulus plan is running out of steam, Ponsi said. China is the world’s biggest consumer of copper, at 57%. Yet after a three-week rally, copper has dropped 2% since Thursday.

That’s bad news for China, he said. “We can look to this industrial metal for clues about China’s health, as well as the health of the global economy.”

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Others have their doubts too. “Amid all the euphoria, the structural issues are still there” for the economy, Rory Green, chief China economist at GlobalData TS Lombard, told The Wall Street Journal.

Memories of past government failures to boost the economy are top of mind for many experts. “My concern about a potential replay of the previous disappointing cycle lingers,” Hebe Chen, an analyst at IG Markets, told Bloomberg.

“It’s still too early to tell if this golden-week rush will blossom into a true gold rush or fizzle out into another mirage.”

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