Why don't per-capita incomes increase in family cities then single cities during economic expansions? (new house)

[lovecrowds]

I think it is interesting how a massive economic expansion doesn't really change the per-capita incomes all that much in family cities as opposed to single or dual-income, few kids cities.

I guess it makes sense if there a husband and wife making $100,000 in Bellevue, Washington and they get a raise because of the economy to $120,000. The per-capita income of the household goes from $50,000 to $60,000. An increase of $10,000 per-capita income

If a husband and wife with 3 children in Pinal County, Arizona or San Bernadino County, California goes from $100,000 to $120,000 income they will go from $20,000 to $22,000. An increase of income that is $2,000 per-capita.

San Bernadino County for example which has had quite a huge economic boom but has high-birth rates has only from $21,400 to $21,600 on per-capita incomes.

Tucson which has a very high percentage of families with children has gone from $20,700 to $20,500 per-capita income despite the huge economic expansion in the Arizona.

Despite, the huge economic expansion with lots of job growth in Arizona it seems as though the per-capita income's in certain areas are declining as younger people feel better about the economy and have larger families.

Pinal County, Arizona which is basically huge, new houses and a bedroom commuter county and with extremely high percentage of families with children has gone from $19,800 to $21,000.

https://factfinder.census.gov/faces/...prodType=table

This while Seattle which is well-known for having more dogs then children has gone from $42,000 to $50,000 per-capita income.

https://factfinder.census.gov/faces/...prodType=table

San Francisco has gone from $47,000 to $57,000 per-capita income. San Francisco has the lowest percentage of children for any large city in America.

[Soonhun]

I think you have really answered your own question. Children don't really contribute to the economy except as indirect consumers and have little, if any, income.