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With limited manufacturing jobs, more people are stuck in low-paying farm work, an unusual trend for a developing country.

China, whose regime has rarely been mistaken as a charitable institution, has poured billions of dollars of aid and investment into developing countries, seeking to extend its own power.

The World Bank gives money and cheap loans to developing countries for poverty alleviation and development.

Like many developing countries today, that era produced explosive innovation, economic progress and staggering degrees of inequality.

Many were richer nations but some were developing countries, the investigators, from the American Cancer Society, say.