In the determining function for Labor productivity given by Labor Prodi = ?0 + ?1Agei + ?2Educationi + Ui, what is the role of Ui?
A. Factors uncorrelated with age and education, and do not impact labor productivity
B. The joint impact of age and education on labor productivity
C. Factors correlated with age but not education, and do not impact labor productivity
D. Factors other than age and education that affect labor productivity
Answer: D
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