What is one thesis that this document supports?
: "The one-child policy has unquestionably Even more consequential is the dramatic caused fertility to decline more rapidly than it otherwise would have...and has therefore played a significant role in China’s demo- graphic transition...explaining up to one- quarter of its per capita GDP growth in the last three decades.... rise in China’s sex ratio at birth, the costs of which will be borne by an estimated 30 million or more Chinese men who will be looking for a wife in 2030 but unable to find one. The one-child policy–in combination with a traditional preference for sons and widespread access to ultrasound technology to detect genderWith that rapid GDP growth has come better nutrition, rising levels of education, longer life expectancies, and higher living standards for the vast majority of Chinese people.... since the mid-1980s–is at *least partly to blame. Other significant emotional costs result from not being allowed to determine your family’s size, being coerced into terminat- ing second pregnancies, or giving birth to a second child who is not allowed to enroll in school or to access the healthcare system.This is not to deny the substantial, and in many cases immeasurable, costs of the policy.... Aside from the obvious economic costs of having more dependents and fewer workers in the population, the policy places a huge burden on single Chinese children at the bottom of the resulting “4-2-1” family structure (four grandparents, two parents and one child)."