If you're worried about putting food on the table or putting a roof over your head, that stress is definitely will contribute to unhappiness, but once you have your basic needs met then incremental money.
Tony HsiehZappos uses call center technology to track average call time per agent. But the goal isn't to reduce this average - it's more important that we make an emotional connection with the customer, rather than just quickly getting them off the phone.
Tony HsiehSorry, investing was pretty boring and I really missed being part of building something. I felt like I was always standing on the sidelines, so Zappos... really liked the people there and got involved full-time and I've been full-time ever since.
Tony Hsieh