.Yi Fuxian, a researcher from the University of Wisconsin-Madison, and Su Jian, an economist at Peking University, co-authored a paper suggesting that China has entered a long-term downward population spiral. The experts warned that the past year will be “remembered as a historical turning point for [the] Chinese population,” arguing that China is “degenerating into a small group of the old and the weak thanks to wrong demographic policies,” the South China Morning Post reported Wednesday.