I have heard any number of culprits fingered for the “demise of the middle class”. The article puts the blame on foreigners and robots. The Sandernistas see it as a matter of “the rich” not contributing their “fair share”, although they aren’t terribly specific about who the rich are and what fair might be. Trumpkins incline to the sneaky Mexican theory. Some point to bankers or the wrong flavor of politician. One suggestion posted here is that our defense establishment is too robust. Some blame declining wages on a general dumbing down of the American population, variously attributed to teachers unions, parsimonious taxpayers, electronic entertainment or organized religion. Others see us in an overall cultural decline: we have become lazy and entitled, and are now paying the price. Others still see a surfeit of lawyers as the cause.