The Growing Gap in Life Expectancy by Income: Implications for Federal Programs and Policy ResponsesNational Academies of Sciences, Engineering, and Medicine The Growing Gap in Life Expectancy by Income: Implications for Federal Programs and Policy Responses. (2015). Population and Development Review, 41(4), 730. https://doi-org.proxy1.ncu.edu/10.1111/j.1728-4457.2015.00099.x