Of course, but given that in the SF example, at least, the proportion of the pop under 18yoa is very low, so that more or less will result in fewer resources de

Of course, but given that in the SF example, at least, the proportion of the pop under 18yoa is very low, so that more or less will result in fewer resources dedicated to education. If the proportion under 18yoa of people were increasing we'd see an investment for the future --but given the characteristics of housing stock in SF, we're not likely to see the proportion of under 18yoa increase significantly in the near future.