In 1970, 62 percent of Americans were considered middle-class (with household incomes between two-thirds to two times the national median income) whereas only 50 percent fell into that category by 2015.
The middle class is one of the social classes in an economy.
The middle class is described as belonging to "households whose annual incomes are not less than two-thirds to double the U.S. median household income."
In the middle class, we find professional and business people and their families. It is the most critical class in an economy.
Thus, research shows that the middle class has been shrinking since the 1970s.
Learn more about the middle class at https://brainly.com/question/26245041
