That’s not a source, that’s a number. You have to link the sources, you can’t just paste Wikipedia. In any case this is a discussion about specifically the American middle class.
Edit’: Also I found the Wikipedia article you’re citing and it directly contradicts your point:
“The modern usage of the term “middle-class”, however, dates to the 1913 UK Registrar-General’s report, in which the statistician T.H.C. Stevenson identified the middle class as those falling between the upper-class and the working-class.[14] The middle class includes: professionals, managers, and senior civil servants. The chief defining characteristic of membership in the middle-class is control of significant human capital while still being under the dominion of the elite upper class, who control much of the financial and legal capital in the world.”
Go check the Wikipedia sources
That’s not a source, that’s a number. You have to link the sources, you can’t just paste Wikipedia. In any case this is a discussion about specifically the American middle class.
Edit’: Also I found the Wikipedia article you’re citing and it directly contradicts your point: “The modern usage of the term “middle-class”, however, dates to the 1913 UK Registrar-General’s report, in which the statistician T.H.C. Stevenson identified the middle class as those falling between the upper-class and the working-class.[14] The middle class includes: professionals, managers, and senior civil servants. The chief defining characteristic of membership in the middle-class is control of significant human capital while still being under the dominion of the elite upper class, who control much of the financial and legal capital in the world.”