In economics, this phenomenon is known as the decline of the Engel'scoefficient.
此现象在经济学上就叫做“恩格尔系数”降低。
2
United States 80 years the average Engel'scoefficient of 16.45%, and now the United States, Engel coefficient was 14%.
美国八十年月的恩格尔系数平均为16.45%，而现在美国的恩格尔系数仅为14%。
3
This is manifested by the decline in Engel'scoefficient, with that for urban and rural residents dropping under 40 percent and 50 percent respectively.