Steve's barking what is middle class pay

Every body talks about the middle class as some kind of income statement, yet nobody defines what middle class pay is.
Does it start at 35,000 dollars a year, or maybe it's 50,0000 dollars?
What is the top of middle class pay 100,000 dollars, or perhaps it's 250,000 dollars?
What we have here is a failure to communicate (define) what middle class pay really is.