Why do married people tend to have higher income than singles or co-habiters?

Married people often have higher incomes than singles or cohabiters due to several factors, including shared resources and financial stability, which allow for more effective budgeting and investment. Additionally, marriage can lead to increased motivation and ambition, as partners may strive to provide for their families. Employers may also perceive married individuals as more stable and committed, potentially leading to better job opportunities and promotions. Lastly, dual-income households often benefit from combined earnings, enhancing overall financial security.