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Nelson Ching for The New York Times

The Well Brain International factory in Shenzhen, China, an appliance maker, has improved salaries and benefits to try to hire more workers.

SHENZHEN, China — Persistent labor shortages at hundreds of Chinese factories have led experts to conclude that the economy is undergoing a profound change that will ripple through the global market for manufactured goods.

The shortage of workers is pushing up wages and swelling the ranks of the country's middle class, and it could make Chinese-made products less of a bargain worldwide. International manufacturers are already talking about moving factories to lower-cost countries like Vietnam.

At the Well Brain factory here in one of China's special economic zones, the changes are clear. Over the last year, Well Brain, a midsize producer of small electric appliances like hair rollers, coffee makers and hot plates, has raised salaries, improved benefits and even dispatched a team of recruiters to find workers in the countryside.

That kind of behavior was unheard of as recently as three years ago, when millions of young people were still flooding into booming Shenzhen searching for any type of work.

A few years ago, "people would just show up at the door," said Liang Jian, the human resources manager at Well Brain. "Now we put up an ad looking for five people, and maybe one person shows up."

For all the complaints of factory owners, though, the situation has a silver lining for the members of the world's largest labor force. Economists say the shortages are spurring companies to improve labor conditions and to more aggressively recruit workers with incentives and benefits.

The changes also suggest that China may already be moving up the economic ladder, as workers see opportunities beyond simply being unskilled assemblers of the world's goods. Rising wages may also prompt Chinese consumers to start buying more products from other countries, helping to balance the nation's huge trade surpluses.

"The next great story in China is how they are going to move out of the lower-end stuff: the toys, textiles and sporting goods equipment," said Jonathan Anderson, an economist at UBS in Hong Kong. "They're going to do different things."

When sporadic labor shortages first appeared in late 2004, government leaders dismissed them as short-lived anomalies. But they now say the problem is likely to be a more persistent one. Experts say the shortages are arising primarily because China's economy is sizzling hot, tax cuts have helped keep people working on farms, and factories are continuing to expand even as the number of young Chinese starts to level off.

Prosperity is also moving inland, and workers who might earlier have migrated elsewhere are staying closer to home.

Though estimates are hard to come by, data from officials suggest that major export industries are looking for at least one million additional workers, and the real number could be much higher.

"We're seeing an end to the golden period of extremely low-cost labor in China," said Hong Liang, a Goldman Sachs economist who has studied labor costs here. "There are plenty of workers, but the supply of uneducated workers is shrinking."

Because of these shortages, wage levels throughout China's manufacturing ranks are rising, threatening at some point to weaken China's competitiveness on world markets.

Li & Fung, one of the world's biggest trading companies, said recently that labor shortages and rising manufacturing costs in China were already forcing it to step up its diversification efforts and look for supplies from factories in other parts of Asia.

"I look at China a lot differently than I did three years ago," said Bruce Rockowitz, president of Li & Fung in Hong Kong, citing the rising costs of doing business in China. "China is no longer the lowest-cost producer. There's an evolution going on. People are now going to Vietnam, and India and Bangladesh."

The higher wages come at a time when costs are already rising sharply across the country for energy and land. On top of a strengthening Chinese currency, this is likely to mean that the cost of consumer goods shipped to the United States and Europe will rise.

To be sure, China is not about to lose its title as factory floor of the world. And some analysts dispute the significance of the shortages.