America's housing crisis is a nationwide problem, but it's especially acute in San Francisco and Seattle, home to the country's largest technology industries.

The "terrible twins," as New York Times reporter Conor Dougherty describes them, represent a perfect storm of rapid job growth, an influx of wealth, and rampant single-family zoning that makes it difficult to densify housing. In an interview with GeekWire this week, Dougherty explained how the two tech hubs have become centers of opportunity for some while squeezing out others.

"The economy changed in some big ways that make inequality much more structural," he said. "And we've not built nearly enough housing where prosperity is happening."

Dougherty has been covering economics and real estate for The New York Times and The Wall Street Journal on-and-off for a decade. He joined us for this episode of the GeekWire podcast to discuss his new book "Golden Gates: Fighting for Housing in America."