Data show that men who are married, and also divorced or widowed men, earn quite a bit more than men the same age who have never been married. this does not mean that a man can raise his income by getting married because men who have never been married are different from married men in many ways other than marital status. suggest one possible lurking variable that might explain the association between marital status and income.

Work ethic, is a lurking variable, because the work ethic i.e the number of hours worked overtime of single men is often less, while the length of breaks is often more compared to married, divorced or widowed men.

Step-by-step explanation:

In to gain a better understanding of the above answer we need to known that

Men who are married, widowed, or divorced are usually more committed both in their personal and professional lives because of the responsibility of not only taking care of them self but their family, enabling them to succeed in their careers.

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thats not a system of equations, that is a solution