According to the text, one factor that causes unemployment and earnings figures to over-predict the amount of economic hardship is the ______.
A.recurrence of periods of unemployment for a group of low wage workers
B.fact that unemployment counts do not include those who work for low wages
C.establishment era system of record keeping that makes it possible to compile poverty statistics
D.prevalence, among low wage workers and the unemployed, of members of families in which others are employed