My definition of mc is so standard that it even matches the wiki definition .....Note the professions. Doctors, managers, even lawyers, dont tend to have enough investments to simply not work at all. People who live off investments alone could be middle class but its not a normal definition of middle class that.you could stop work tomorrow (interestingly tho wikipedia says that was the 19th century definition, which I didnt know, but probably decsribed people like lever, rich but not old aristos)
The following factors are often ascribed in modern usage to a "middle class":[by whom?]
Achievement of tertiary education.
Holding professional qualifications, including academics, lawyers, chartered engineers, politicians, and doctors, regardless of leisure or wealth.
Belief in bourgeois values, such as high rates of house ownership, delayed gratification, and jobs which are perceived to be secure.
Lifestyle. In the United Kingdom, social status has historically been linked less directly to wealth than in the United States,[6] and has also been judged by signifiers such as accent (Received Pronunciation and U and non-U English), manners, type of school attended (public school), occupation, and the class of a person's family, circle of friends and acquaintances.[7][8]