Almost 90% of the world's population now live in countries with falling marriage rates. One major factor is the changing economy," said Brad Wilcox, director of the National Marriage Project at University of Virginia. "Governments all over the world are worried because of economic implications," said Leng Leng Thang of National University of Singapore. The decline in marriage rates is turning into a demographic crisis for Japan — which is the world's third-largest economy and home to the world's oldest population. Watch the video above to learn what causes increasing number of couples around the world to opt out of marriage.

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Persons: Brad Wilcox, Leng Leng Thang, Ye Liu Organizations: University of Virginia, National University of Singapore, King's College Locations: U.S, Asia, Japan, China, King's College London