The line is subsistence, not being a billionaire. If you don’t have food, shelter and health care you are often very very in happy. If you have those, each addi

The line is subsistence, not being a billionaire. If you don’t have food, shelter and health care you are often very very in happy. If you have those, each additional dollar contributes a much smaller degree of happiness. The research suggest the line for diminishing returns in the US is $80k in most cities.