[pjc50]

> 30 homes might approximate something like 60 cars and 60 children.

> Now instead of 30 homes, you have 20 + 10*4 = 60 homes.

Not building the houses doesn't make the people go away. What ends up happening is they have to commute in from somewhere else, and

> the road leading out your development had to accommodate 50 cars in the morning commute, now it has to handle more than 100

happens in a different road.

(sure, in the long run people learn not to have children in the West because living space is scarce, and your "doubled the amount of school children" problem goes away)