In fact, why work at all? The reality is that productivity is necessary for survival; if no one produced, no one would live. If we produce a little extra past what is necessary for survival, then we can save it and ensure we will always have something to live on. Working hard is just a means of saving more for the future. There is no scenario in which people become less productive and have a better capacity to provide for their futures. Working hard just makes good economic sense.