Meet San Francisco's 'permanent underclass' — and the ones who think they still have a shot

Getty Images; Tyler Le/BI Halfway through our interview with Kacie Barrett, a 26-year-old project manager in San Francisco, her screen froze. When she came back on 30 seconds later, she apologized for the choppy WiFi, a result of downsizing her Xfinity internet package from $120 to $40 a month,…