It is probably first mover effect. Bay Area had silicon valley. Remember silicon? Many things involving semiconductors and electronics grew up in the Bay Area b

It is probably first mover effect. Bay Area had silicon valley. Remember silicon? Many things involving semiconductors and electronics grew up in the Bay Area because of Fairchild and the traitorous 8. In fact, you could make the argument that the first generation of electronics businesses involving vacuum tubes were in the area as well (in Oakland). Software companies growing there happened later when the semiconductor money needed something to invest in, and computers were something semiconductor people understood. Nobody wonders at Wall Street being a center of finance after some 18th century traders met under a buttonwood tree, nobody wonders at Hollywood continuing to be a center of film and TV production, and nobody should wonder at Bay Area being a center of software development.