The announcement of the relaxation of China's one child policy created great discussion in China and internationally. But its significance was widely misunderstood. Contrary to myth, the increase in China's labor supply plays little role in China's rapid economic growth. In reality, 96 percent of China's economic growth comes from factors other than a rising labour supply. Therefore, there is no reason why China's economy should slow significantly because China's working age population stopped growing in 2012. The mistaken view, sometimes expressed, that China will grow old before it becomes rich is therefore the reverse of the reality: China will grow rich before it grows old. To demonstrate clearly why, first the facts will be stated and then their implications analysed.
A worker of a company processes galvanized products in Qingdao, east China's Shandong Province,[Xinhua/Yu Fangping]
Even an elementary back of an envelope calculation shows why increases in China's working age population have made only a relatively small contribution to China's economic growth. Indeed, this is so immediately clear it is somewhat of a puzzle that the myth ever existed in some quarters that China's growth depended essentially on increases in labor and therefore China's economic growth faces a serious "demographic challenge" due to the end of the increase in the working age population.
From the beginning of reform in 1978 up to 2012, the average annual increase in China's population aged 15-64, the international definition of working age, was 1.7 percent. Over the same period the annual average increase in China's GDP was 10.2 percent -- almost six times as fast. The increase in China's working age population was therefore only 17 percent of the rate of increase of China's GDP -- showing clearly that the rate of growth of population could not possibly explain, or be the main reason for, China's rapid economic growth.
Looking at the trends in more detail shows still more clearly that population trends did not determine China's economic trajectory. Taking five year moving averages for changes in working age population and GDP, to remove the effects of short term fluctuations, China's average annual growth rate of working age population was 2.8 percent in 1983, five years after the beginning of reform. By 2000 this had fallen to 1.6 percent, and by 2012 it was only 0.6 percent. The growth rate of China's working age population was therefore consistently falling.
But China's GDP growth showed the exact opposite trend. Annual average GDP growth rate was 8.1 percent in 1983, 8.6 percent by 2000, and 9.3 percent by 2012. Therefore while the growth rate of China's population was falling its economy was accelerating! This shows clearly changes in China's labor supply were not the prime cause of its economic growth.
Making exact calculations shows the situation even more graphically. It might be naively imagined that as China's working age population grew at 17 percent of the rate of its GDP increase therefore increases in labour accounted for 17 percent, which is under one fifth, of the increase in China's economic growth. This contribution would already seem surprisingly small for those who believe increases in working age population was a major factor in China's economic development, that China's growth rate must therefore now necessarily fall sharply, and China will "grow old before it grows rich." But in reality even 17 percent is a great exaggeration of how much increase in the labor supply contributed to China's growth.
The reason for this is that the increase in the amount of time actually worked grows more slowly than the increase in the working age population. This is because the period of time spent in education rather than work tends to increase, vacations tend to get longer reducing the number of days worked, and other factors.
To show the effect of this, the chart shows the sources of China's GDP growth in 1990-2010 -- the latter being to the latest date for which international comparisons are available. As can be seen, 64 percent of China's growth was due to investment increases, 30 percent to increases in productivity, and only 6 percent to increases in labor. China's rapid economic growth was therefore overwhelmingly driven by increases in investment and increases in productivity with increases in the labour supply playing only an extremely small role. Given its growth rate, eliminating the entire increase in labor into China's economy would have taken only half a percent from China's GDP growth.
But even that 6 percent number slightly exaggerates the role of increases in labor supply in China's economic growth! Increase in labor contribution to economic growth take place due to two processes. The first is a rise in the number of hours worked as the workforce gets bigger (the increase in labor quantity). The second is the improvement in skills and education -- a skilled worker creates more value than an unskilled one (the increase in labor quality).
The increase in China's labor quality is 2 percent per year, in line with the average for developing countries. This has a modest scope to increase with higher expenditure on education and skills -- the average increase in labor quality in a developed economy is 3 percent a year. Only 4 percent of China's GDP growth comes from increases in the quantity of labor, which are affected by demographics.
In short, increases in China's labor supply, due to expansion of the working age population, accounted for only 4 percent of China's total GDP growth -- less than half a percentage point of annual GDP growth!
Claims by those such as that by Financial Times writer David Pilling that "the song of China's miracle has a three-word refrain: Just add people" are therefore absolute nonsense. Only 4 percent of China's growth came from "adding people" and 96 percent came from factors other than "adding people!"
This does not mean no economic problems are created by China's aging population. But these come from a completely different route than shortage of labor. The real economic difficulty China faces with regard to population is that people in work can save, while those not working, because they are too young or too old, generally do not save. The decline of the percentage of China's population in work therefore tends to lower China's household savings rate. As investment necessarily has to be financed by savings, this puts downward pressure on China's investment rate, and as investment is the main source of economic growth not only in China but in most economies this could lower China's economic growth. While the decline in China's working age population does not pose a risk of significant economic slowdown due to lack of labor, it could cause a problem due to fall in savings.
But fortunately households are only one of three sources of savings. Of the other two, government savings are small in almost all countries, and usually negative. But company profits are the biggest source of saving in China. If savings via company profits were to increase, this can compensate for any decline in household savings due to the fall in the percentage of the population which is working.
Maintaining high growth in China therefore depends more on maintaining company profitability than it does on population. A decline in company profitability is a much more serious threat to China's growth than any demographic factor. A rise in company profitability, through its effect in raising company savings, would be a far more powerful factor in maintaining China's economic growth than relaxing the one child policy.
In summary, the claim that China faces a significant slowing of its economy due to population factors, and therefore China will "grow old before it grows rich," is a typical example of myths created by engaging in woolly rhetoric without using numbers. Increases in labor supply play such a small role in China's economic growth that the end of the rise in the working age population will have only a very small effect in reducing China's growth rate. It is what happens to China's productivity, and above all its investment, that overwhelmingly will determine its economic growth and therefore its prosperity. Provided the correct policies are pursued, China will certainly become rich before it becomes old.
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