How do you understand Hong Fincher’s usage of the term “Leftover Women”?

How do you understand Hong Fincher’s usage of the term “Leftover Women”? What does it mean and where does the term come from? This article was written in 2014. Do a bit of internet research and decide if you think the trends mentioned in the article have continued to get worse or have any of the issues been addressed. Also how does the current status of women in China compare to Japan, Korea or Vietnam? How does the Mainland compare to Hong Kong, Macau or Taiwan? Can you account for any of the discrepancies?