Happiness

HAPPINESS = HAVEs - WANTs. 

HAPPINESS can be material or immaterial. HAPPINESS can be negative, when WANTs > HAVEs. There are people who are (almost) always happy and such that are (more or less) always unhappy. To increase HAPPINESS, HAVE more or WANT less. Absolute LEVELs of HAVEs and WANTs may range from very low to very high, to an extent that the increase in HAVEs or the decrease in WANTs may not be trivial to achieve.

HAPPINESS(overall) = a * HAPPINESS(health) + b * HAPPINESS(success) +  c * HAPPINESS(social) + d * HAPPINESS(inspiration) + e * HAPPINESS(time) +  f * HAPPINESS(other)

Coefficients (a, b, c ...) may differ between individuals and also may change over time.