Thing is, DR1 is made up of a number of nationalities, and each country has its own definitions. NALs' list only applies to the US. In any case, as others have pointed out, education, income and culture/values do not always co-relate.
Just as an illustration, here are the definitions used in UK marketing to define social groups - these are based entirely on educational/professional factors, so marketeers are always trying to find other ways of pigeonholing their target markets, especially with regard to culture, attitudes and politics:
A - Upper middle: Higher managerial, administrative or professional
B - Middle - Intermediate managerial, administrative or professional
C1 - Lower middle - Superiors or clerical, junior managerial, administrative or professional
C2 - Skilled working - Skilled manual workers
D - Working - Semi-skilled and un-skilled manual workers
E - Those at lowest level of subsistence - State pensioners or widows, casual or lower-grade workers
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