Unlimited Labor Supply in China? Not Anymore!
Every few months someone in the Western business press rediscovers that Guangdong factories cannot find enough workers. The coverage frames it as a puzzle—how can the world’s most populous country have a labor shortage? Cai Fang at the Chinese Academy of Social Sciences has been saying for two years that it is not a puzzle at all. It is the Lewis turning point, arriving earlier than the textbook predicted.
The Lewis model is the foundational framework here. W. Arthur Lewis’s 1954 paper “Economic Development with Unlimited Supplies of Labour” describes a dual economy: a traditional subsistence sector with marginal product near zero, and a modern capitalist sector that draws from it at a fixed wage. As long as rural surplus labor exists, manufacturers can expand without bidding up wages. Growth is cheap. The turning point comes when the surplus is exhausted and the rural labor market tightens. After that, wages start rising faster than productivity and the cost advantage erodes.
Cai Fang’s argument, developed in a paper circulating through CASS this year, is that China is approaching this inflection faster than demographic projections suggested a decade ago. The one-child cohort born in the early 1980s is now fully in the workforce. Cohort sizes entering working age peaked around 2000 and are now falling. Meanwhile, the absorption of rural labor into manufacturing has been running for twenty-five years at a pace Lewis himself would have found extraordinary—by some estimates, 150 million people have moved from farm to factory since 1980.
The field evidence this spring is consistent with the thesis. The Federation of Hong Kong Industries surveys its Guangdong-based members every year. The 2006 survey, released in January, found that 70% of respondents reported difficulty recruiting workers in the Pearl River Delta. The Chinese term is 民工荒—literally, migrant worker shortage—and it appeared in news coverage as early as 2003 but was initially dismissed as a temporary mismatch between where factories were and where workers came from. It does not look temporary anymore. Minimum wages in Guangdong were raised again in January, to 690 yuan per month in Guangzhou, and Shenzhen raised its minimum to 810 yuan. These are not trivial adjustments. They represent increases of 12–18% year-on-year in nominal terms.
Some skeptics push back on the Lewis interpretation. Gordon Hanson at the University of California, San Diego has argued that Chinese wages have been rising since the late 1990s without necessarily indicating a structural turning point—it could simply be productivity growth being passed through. And China’s interior provinces still have substantial agricultural populations that could in theory supply coastal factories for another decade if hukou restrictions loosen and infrastructure improves. The migrant labor pipeline is not simply a function of surplus supply; it depends on migration costs and the regulatory framework governing internal movement.
That caveat matters, but it does not fully account for the pattern. The factories that cannot fill their lines are not offering poverty wages; they are offering wages that represent a meaningful premium over local alternatives. If there were large pools of workers rationally choosing to stay in Hunan or Sichuan because of hukou barriers, you would expect aggressive recruitment in those provinces to produce results. Recruiters who drove buses to rural Sichuan in the spring of 2005 reported that the catch was thinner than in prior years.
What does it mean if Cai Fang is right? Chinese manufacturing’s cost advantage has always rested on three legs: cheap labor, undervalued currency, and compressed domestic demand. The wage leg is looking shakier than it did five years ago, which puts more pressure on the other two. It also creates a policy imperative to move up the value chain—to shift from assembly toward design and component manufacturing, which is exactly what the 11th Five-Year Plan’s industrial policy sections are gesturing at, however vaguely.
The wage trajectory intersects with a point that gets less attention in trade debates: the comparison between Chinese and Indian labor markets. The gap in manufacturing wages between the two countries is smaller than headline GDP figures imply, as our breakdown of Chinese and Indian minimum wage structures shows. The on-the-ground reality in the Pearl River Delta’s factory zones, where this wage pressure is most acute, is worth reading alongside the industrial geography of Guangdong. And the political context—why the NPC this month was specifically concerned about labor income shares and not just output growth—connects directly to the story about the political signaling embedded in Beijing’s GDP figures.