根據統計 越窮生越多
https://www.statista.com/statistics/241530/birth-rate-by-family-income-in-the-us/
"the birth rate in the United States was highest in families that had under
10,000 U.S. dollars in income per year, at 63.14 births per 1,000 women. As
the income scale increases, the birth rate decreases, with families making
200,000 U.S. dollars or more per year having the lowest birth rate,"
在美國生育率跟家庭收入呈反比
As the income scale increases, the birth rate decreases
不只在美國 世界各地都這樣
Income and high birth rates are strongly linked, not just in the United
States, but around the world.
有人說是m型化
不過依照那一張統計圖表 並沒有顯示m型化 而是負相關