in our terminololy，“classes” are not communities；they merely represent possible，and frequent，bases for social action. we may speak of a “class” when （1） a number of people have in common a specific causal component of their life chances，insofar as （2）this component is represented exclusively by economic interests in the possiblession of goods and （3） is represented under the condition of the commodity or labor markets.this is “class situation”
