Historian and urbanist Richard Walker, a professor emeritus at UC Berkeley, talks with Recode’s Kara Swisher about his latest book, Pictures of a Gone City: Tech and the Dark Side of Prosperity in the San Francisco Bay Area.In this episode: How California has historically been affected by economic growth; the Bay Area’s first tech boom, the 1849 gold rush; why has California had so many booms?; the social impacts of this change; waking up to the downside of tech prosperity; “money is literally burning holes in their pockets”; the "bottleneck effect” that created the housing crisis and shoved out the working class; why “just build more” isn’t a realistic solution; what does “gone city” mean?; taxes, job growth and the coming recession; how the ubiquity of tech will spur innovation — but not necessarily in San Francisco; and why taxing the rich and big corporations creates equality. Today's show is brought to you by Microsoft Azure. Check out: Azure.com/trial to sign up for a trial today!