Never confuse correlation with causation. If a city has high-paying jobs but doesn’t build enough housing for all the people working those jobs or the economy

Never confuse correlation with causation. If a city has high-paying jobs but doesn’t build enough housing for all the people working those jobs or the economy supporting those jobs, only those with lots of money to spend can afford housing, food, &c. Presto, you get a high proportion of “DINKs” (double-income, no kids.) Either explanation may drive the presence of high costs and density of DINKs. Or both: Perhaps the two things create a cycle of costs spiralling up combined with a change in demographic.