Markers
Some definitions of class look only at numerical measures such as wealth or income. Others take into account qualitative factors, such as education, culture, and social status. There is no consensus on which of these variables is essential and which are merely common correlates. It is also disputed whether sharp lines can be drawn; one point of view in the debate:
A stratified society is one marked by inequality, by differences among people that are regarded as being higher or lower...it is logically possible for a society to be stratified in a continuous gradation between high and low without any sharp lines...in reality...there is only a limited number of types of occupations... People in similar positions...grow similar in their thinking and lifestyle...they form a pattern, and this pattern creates social class.
—Dennis Gilbert, The American Class Structure, 1998
Read more about this topic: Social Class In The United States