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Facebook didn't make the area expensive. No tech company did. Those local businesses, and the chains alike, have made it expensive. So much blame gets put on the tech companies, but the tech companies aren't raising the prices, they are just paying people better, and the local businesses abuse that to the fullest extent. There is no NEED to charge $6 for a gallon of milk, when milk from those same cows is sold for $2 50 miles away... thats not a SV valley tech company problem, its a SV valley retailer problem, and the blame needs to shift that way...You're attacking a false target. Buying food in the bay area isn't expensive. Rent and housing is expensive. There's a great Costco in mountain view that charges the same prices as Costco most other places. Similar for other grocery options.
When I lived there last year, our food bills were comparable to living in Pittsburgh. Our rent on a 3br/1ba house, not renovated since 1956, with a portable dishwasher in the garage... was 50% more than my mortgage is in Pittsburgh for a decent size house in a lovely little neighborhood 3/4 of a mile from my work. It was rather shocking.
It's a combination of high salaries and crappy housing policy leading to an explosion in property costs.