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This picture taken on February 15, 2017 shows a woman cooking food outside her shop in the Heiqiaocun migrant village in Beijing. China's capital relies on migrant labour to keep its economy humming and people from across the country are drawn to the city by the promise of a better life. But high real estate prices and China's restrictive residence registration system, known as hukou, have driven many into shanty towns on Beijing's periphery. / AFP / Nicolas ASFOURI (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)

This picture taken on February 15, 2017 shows a woman cooking food outside her shop in the Heiqiaocun migrant village in Beijing.
China's capital relies on migrant labour to keep its economy humming and people from across the country are drawn to the city by the promise of a better life. But high real estate prices and China's restrictive residence registration system, known as hukou, have driven many into shanty towns on Beijing's periphery. / AFP / Nicolas ASFOURI        (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)