[modriano]

People don't value all amenities equally, and as people age, their personal amenity-valuations change, often in stepwise ways. For example, prior to having a school-aged child, an individual might value good-elementary-school-access very little, but if they have a child, their valuation of that amenity will likely rise sharply within a few time-needed-to-move units of their kid being school-aged.