For every dollar spent on early child development you save $7 over the life course because children with better early child development are less likely to end up delinquent, involved in crime, unemployed and so on.
Michael MarmotLow income is related to poorer housing, poorer diet, fewer social amenities, worse working conditions. (...) After adjustment for age, sex, race, smoking, alcohol consumption, sleep habits, leisure-time physical activity, chest pain, diabetes, or cancer, there was still an increase risk of 1.6 for those with inadequate incomes.
Michael MarmotGeneral improvements in health/decline in mortality do not affect all classes equally. As mortality rates fall, social inequalities commonly widen.
Michael Marmot