An alternative approach:
Relative income is more important than absolute income. Absolute income is measured using one holy and inalterable variable: the raw and almighty dollar. Jane Doe makes $100,000 per year and is thus twice as rich as John Doe, who makes $50,000 per year.
Relative income uses two variables: the dollar and time, usually hours. The whole “per year” concept is arbitrary and makes it easy to trick yourself. Let’s look at the real trade. Jane Doe makes $100,000 per year, $2,000 for each of 50 weeks per year, and works 80 hours per week. Jane Doe thus makes $25 per hour. John Doe makes $50,000 per year, $1,000 for each of 50 weeks per year, but works 10 hours per week and hence makes $100 per hour. In relative income, John is four times richer.
Of course, relative income has to add up to the minimum amount necessary to actualize your goals…