When US cities spurn growth, national equality suffers

Boulder, Colorado

THE small city of Boulder, home to the University of Colorado's flagship campus, has a booming local economy and a pleasantly compact downtown with mountain views. Not surprisingly, a lot of people want to move here.

Something else is also not surprising: Many of the people who already live in Boulder would prefer that the newcomers settle somewhere else.

"The quality of the experience of being in Boulder, part of it has to do with being able to go to this meadow and it isn't just littered with human beings," said Steve Pomerance, a former city councilman who moved here from Connecticut in the 1960s.

All of Boulder's charms are under threat, Mr Pomerance said as he concluded an hourlong tour. Rush-hour traffic has become horrendous. Quaint, two-story storefronts…