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Introduction, 423. — The problem of method, 424. — Proposed procedures, 425. — Statistical method and source of data, 426. Explanatory factors in addition to education, 427. — Search for interaction effects, and more detail on education, 430. — Estimated lifetime earnings, 432. — Qualifications, 435. — Summary, 436.
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Morgan et al. (1963) studied this question.
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