National income is the total value of a country's final output of all new goods and services produced in one year.
The Human Development Report measures development by combining three indicators— Health, Education, and Standard of Living —converted into a composite human development index.
Most people probably believe that happiness is in the eye of the beholder, an individual’s choice, something to be pursued individually rather than as a matter of national policy.
An increase in economic variables like income over a period of time is economic growth. Higher economic development requires higher economic growth. But it is not always true.