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 of a 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