Education regulators designed school zoning for the sake of equality. If all children in every locality were to attend their local school, they reasoned, all schools would have roughly the same range of abilities among the pupils and no state school would face undue competition.
It has not worked, as plenty of urban schools with declining rolls can attest. But if any Government proposed to abolish zoning today there would be an outcry from homeowners within zones drawn for prestigious schools.
Yesterday we reported that median house prices in Auckland's "Grammar zone" passed $2 million last year, double the median price 10 years before.
The arbitrary line that schools such as Auckland Grammar and Epsom Girls Grammar have been obliged to draw around themselves has created substantial wealth for those fortunate enough to have a house within it, and fierce resistance to any variation at the margins.
When a neighbouring school drew a zone that slightly overlapped the Grammar zone a few years ago it householders in the overlap consulted lawyers for fear the Grammar zone could be reduced.