Inverse population density
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Nuclear is still the most common, but there are millions of households in the United States with a different family structure.
This is who marries whom, based on what one does for a living.
Whether it’s because of experience, physical ability, or education level, some jobs tend towards a certain age of worker more than others.
Work changed over the years. Salaries changed over the years. I was curious: If you compared your personal income from present day, how would it compare to the distribution of salaries in previous decades?