right to health and broader social and economic rights". Increased inequality China's growth has been so rapid that virtually every household has benefited significantly, fueling the steep drop in poverty. However, different people have benefited to very different extents, so that inequality has risen during the reform period. This is true for inequality in household income or consumption, as well as for inequality in important social outcomes such as health status or educational attainment. Concerning household consumption, the Gini measure of inequality increased from 0.31 at the beginning of reform to 0.45 in 2004. To some extent this rise in inequality is the natural result of the market forces that have generated the strong growth; but to some extent it is "artificial" in the sense that various government policies exacerbate the tendencies toward higher inequality, rather than mitigate them. Changes to some policies could halt or even reverse the increasing inequality. (See List of countries by income equality.) The Nobel Prize-winning economist Sir Arthur Lewis noted that "development must be inegalitarian because it does not start in every part of the economy at the same time" in 1954. China classically manifests two of the characteristics of development that Lewis had in mind: rising return to education and rural-urban migration. As an underdeveloped country, China began its reform with relatively few highly educated people, and with a small minority of the population (20%) living in cities, where labor productivity was about twice the level as in the countryside. In pre-reform China there was very little return to education manifested in salaries. Cab drivers and college professors had similar incomes. Economic reform has created a labor market in which people can search for higher pay, and one result of this is that salaries for educated people have gone up dramatically. In the short period between 1988 and 2003, the wage returns to one additional year of schooling increased from 4% to 11%. This development initially leads to higher overall inequality, because the initial stock of educated people is small and they are concentrated at the high end of the income distribution. But if there is reasonably good access to education, then over time a greater and greater share of the population will become educated, and that will ultimately tend to reduce inequality. The large productivity and wage gap between cities and countryside also drives a high rate of rural-urban migration, which has