题目内容：
According to the text，one factor that causes unemployment and earnings figures to over-predict the amount of economic hardshipis 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
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