> What is the shape of the relationship between money and happiness, and what are its implications?

1. money != income.

2. Zip codes.

3. Age.

4. Social class.

a) 65 year old professor living in Woodside, CA, with a net worth of $250,000K

b) 35 year old HVAC business owner living in Fresno, CA, with a net worth of $2,000,000

First is poor, second is rich, but the study conflates both into the same bucket if they both make, say, $400K/yr