Want best bang for buck in policy in terms of re-election as well as improvements in well-being for your population?

Spend it on mental health, according to this very interesting policy research. In terms of government expenditure, it is both super cheap and leads to super impressive outcomes.

What gives you best future outcomes? Spending money on the mental health of mothers and schooling systems that focus on the emotional health of children (especially in high school).

(And I suspect some of the income inequality effects in this research are crowded out by work intensification lifestyle effects).