"Middle class" is often used as a translation of "bourgeoisie" from "bourgeois" which literally means "town dweller" ie. a city dweller.[0] It also means "someone who belongs to neither the aristocratic, clerical, nor military classes."[0] This distinction was useful because the Three Estates system grouped both city dwellers and peasants into a single class (the third estate).[1] Similarly the English word "middle class" was at one point used by Marxists to describe non-aristocratic, non-working class urbanites and equated middle class directly with "bourgeoisie."[2] This class included factory owners who could be richer than the average noble. Our modern usage of "middle class" would never include factory owners, bankers etc. but this definition did.
You end up with something like this:
Old: Nobles -> "Middle class" -> Peasants
Marxist: -> Nobles -> "Middle class" -> Working Class
In both of these, "middle class" means "Not a noble. Could be a rich merchant"
Modern: Rich -> "Middle class" -> Working class
Here, "middle class" means "Middle income. Owns a house or an expensive apartment." "Working class" is the common term used here but also includes people that do not work.
>Around median income is already a thing we have a name for (we can call it median income),
Nobody uses this term. For example, nobody would say they are a "median income" family. Additionally, not all of what people today would consider "working class" work for other people, and cannot join a union. For example, street vendors often do not make much money[3] and it does not make much sense to categorize them as "middle class" because they are not being exploited by their employer (as they have no employer). Unions exist for highly skilled jobs as well, such as air traffic controllers, which make $137,380 per year on average.[4][5] Defining "middle class" as someone who "doesn't need a union" (taking how to qualify that as given) also leaves open the question of what the "upper class" means in that scenario, being that we are not using income as the barometer for class in favor of union status. Would the street vendor be "upper class" if he had a worker? If anything, I would say we already have a term for what you are essentially describing: "unskilled labor." Unskilled laborers need unions more than skilled ones. This is a direct effect of unskilled laborers making less money due to lack of a marketable skill.
>it tells us approximately nothing about their position in terms of labor relations or social class.
It actually tells us a great deal about social class. People of similar incomes will live in their own neighborhood whether or not they have that money from being in a union or from a non union job (leaving the definition of that aside). It is all decided by income level. Living in a middle class suburb is a vastly different experience from living in an apartment in a poor neighborhood in the city.
Lastly, the "right" definition is not really important as much as explaining what you mean by that word when you use it. In the context of history, as in this article, the definition definitely matters.
You end up with something like this:
Old: Nobles -> "Middle class" -> Peasants
Marxist: -> Nobles -> "Middle class" -> Working Class
In both of these, "middle class" means "Not a noble. Could be a rich merchant"
Modern: Rich -> "Middle class" -> Working class
Here, "middle class" means "Middle income. Owns a house or an expensive apartment." "Working class" is the common term used here but also includes people that do not work.
>Around median income is already a thing we have a name for (we can call it median income),
Nobody uses this term. For example, nobody would say they are a "median income" family. Additionally, not all of what people today would consider "working class" work for other people, and cannot join a union. For example, street vendors often do not make much money[3] and it does not make much sense to categorize them as "middle class" because they are not being exploited by their employer (as they have no employer). Unions exist for highly skilled jobs as well, such as air traffic controllers, which make $137,380 per year on average.[4][5] Defining "middle class" as someone who "doesn't need a union" (taking how to qualify that as given) also leaves open the question of what the "upper class" means in that scenario, being that we are not using income as the barometer for class in favor of union status. Would the street vendor be "upper class" if he had a worker? If anything, I would say we already have a term for what you are essentially describing: "unskilled labor." Unskilled laborers need unions more than skilled ones. This is a direct effect of unskilled laborers making less money due to lack of a marketable skill.
>it tells us approximately nothing about their position in terms of labor relations or social class.
It actually tells us a great deal about social class. People of similar incomes will live in their own neighborhood whether or not they have that money from being in a union or from a non union job (leaving the definition of that aside). It is all decided by income level. Living in a middle class suburb is a vastly different experience from living in an apartment in a poor neighborhood in the city.
Lastly, the "right" definition is not really important as much as explaining what you mean by that word when you use it. In the context of history, as in this article, the definition definitely matters.
[0] https://en.wiktionary.org/wiki/bourgeois#French
[1] https://en.wikipedia.org/wiki/Estates_of_the_realm#Third_Est...
[2] https://en.wikipedia.org/wiki/Middle_class#History_and_evolu...
[3] https://hunterurbanreview.commons.gc.cuny.edu/the-smallest-o... - this article says the average salary for street vendors in NYC is $14,000 which I think is too low to be correct but I can imagine many are making less than average salary.
[4] https://www.bls.gov/ooh/transportation-and-material-moving/a...
[5] https://en.wikipedia.org/wiki/National_Air_Traffic_Controlle...