A couple of main ones:
since they cant spread any more they go up, they start to stack their houses, and they live in small chambers with only a bed.
When they purchase a car they must show proof that they have a place to park it.
For subways they have white collar professionals called pushers (oshiya) that push everybody who are trying to get on the subway.
They start to cremate rather than bury, since a grave takes more space.
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