Studies indicate that married men on average earn more income than unmarried men of the same age

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Studies indicate that married men on average earn more income than unmarried men of the same age and education level. Why must we be cautious in concluding that marriage is the cause and higher income is the effect?

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Economics

ISBN: 978-0073375694

18th edition

Authors: Campbell R. McConnell, Stanley L. Brue, Sean M. Flynn

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