You do realize that there are people in those cars, right?<p>In any case, the use of the analogy is correct. People are currently moving to the Bay Area because of the concentration of tech jobs and talent and investor money here. More people moving here means a greater concentration of the things that make people move here. For years this could be seen as a virtuous circle, but I think it has gone well past that. Especially if, as is widely felt, that we are in another bubble fueled by cheap investor money.