The Bay Area is constantly evolving. We've gone from the Gold Rush to Silicon Valley; shifted from boom to bust, and back again. It can feel a little bit like déjà vu. Back in 2000, just before the dot-com bubble burst, unemployment in San Francisco was at an all-time low of 3 percent. It’s nearing that again – approaching what economists call "full employment," meaning, statistically anyway, there are jobs for everyone who wants one.