The industry once thought big, but today's wave of start-ups is characterized by a rise in services aimed at the wealthy and the young.
With a few taps on a phone, for a fee, today's hottest start-ups will help people on the lowest rungs of the 1 percent live like their betters in the 0.1 percent. These services give the modestly wealthy a chance to enjoy the cooks, cleaners, drivers, personal assistants and all the other lavish appointments that have defined extravagant wealth. As one critic tweeted, San Francisco's tech industry "is focused on solving one problem: What is my mother no longer doing for me?"
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