In considering the impact of public policies such as tax rates or divorce laws, many psychologists believe that assessments of would be the most useful for guiding nations toward policies that foster human flourishing.

The answer is "subjective well-being".

Subjective well-being (SWB) is the logical term for bliss and life fulfillment—considering and feeling that your life is going admirably, not seriously. Researchers depend principally on self-report studies to survey the joy of people, yet they have approved these scales with different sorts of measures. Individuals' dimensions of abstract prosperity are impacted by both inward factors, for example, identity and standpoint, and outside elements, for example, the general public in which they live. A portion of the subjective well-being of abstract prosperity are an individual's characteristic personality, the nature of their social connections, the social orders they live in, and their capacity to meet their essential needs.  

which sentences ? that question is incomplete

haile selassie i was the emperor of ethiopia from 1930-1974