well, a full answer to the question would also need the percentage of college graduates that land jobs in big companies in the valley...<p>P.S. I don&#x27;t think we&#x27;ll get far with this... i just noticed, e.g., &quot;median household income in the US&quot; - that seems a tricky thing to compare with, given that many ppl in the US don&#x27;t have health insurance, or live in trailer parks eating off food stamps...