As Wittgenstein might put it, there are two language games at play here.   The first one takes &#x27;class&#x27; as defined in the (legitimate) Marxist way, used to represent the relationship to the means of production (Edit:  we don&#x27;t produce all that much anymore, making that definition harder to parse).  The second takes it to be specifically defined as a range of income distribution.  That second one is what most people typically take to mean by &#x27;class&#x27;.<p>While I agree there&#x27;s a lot more than income at play in social policy and understanding of society and economics, it&#x27;s still an absolutely fascinating set of stats to bring up.  I will say I&#x27;m more disappointed by the huge ranges of the various distributions in the study (as pointed out by other commenters)