By Lu Ming

The author is a professor with Fudan University

Among the wide variety of topics discussed after the May 12 earthquake, one is particularly interesting: whether the quake would worsen the labor shortage in our country.

This issue has been in public focus since 2004, and the academia is divided on it.

One group of scholars thinks the labor shortage in China is at hand because the coastal areas, the traditional destination of migrant workers after they leave their rural home to seek industrial jobs, are facing a low supply of labor and the average salary is continuously rising in recent years.

Another group takes the view that the labor supply will no longer be as unlimited as it was. And a third one, with which I agree, holds that a labor shortage is still far away at this moment.

Our opinion is based upon several solid facts, the primary one of which is that China's urbanization rate is relatively low compared with the scale of its industrialization. And this rate is also lower than that in other countries under similar development levels.

Meanwhile, many researches suggest the income gap between urban and rural populations keeps widening despite all the State efforts to stimulate the development of agriculture and raise the income of rural residents.

This gap is also a proof that the labor shortage is yet to come because it would be narrowed quickly when migrant workers have a considerable rise in their salary, which is a significant part of the rural residents' income, if the demand for labor outnumbers its supply.

Another income gap also becomes obvious between urban groups with and without local identity papers under the household registration system. Local identity brings better pay when the surveyed have roughly the same qualifications, including education degrees.

Combining all these facts, it is not convincing to say that China is having a labor shortage.

Admittedly, it is true that the coastal areas could not find enough hands for their industries, but there is an array of complex factors for this temporary and regional scarcity.

The demographic structure of our labor force is one of the most important ones. Since the country suffered three years of natural disasters between 1958 and 1961, in which many lives were lost, it had an obvious decrease in the population aged around 20 in the 1982 national census. It is easy to see that children born from this group would decrease.

And during the same census, the population under four years old is also small for the State formally initiated the family planning policy in 1980.

By 2005, the supply of migrant workers sharply decreased, especially those about 24 years old. On the one hand, the population about this age is relatively small for the above two reasons. On the other hand, they have also reached the age of marriage, after which most tend to stay with families instead of seeking jobs in cities.

This demographic element is a direct reason for the diminished number of migrant workers.