> If you had a society where people worked 80 hour weeks to produce X amount of economic activity, and you moved that to a society working 20 hour weeks with th

> If you had a society where people worked 80 hour weeks to produce X amount of economic activity, and you moved that to a society working 20 hour weeks with the same productivity, that's an improvement in everyones individual lot. And that would show up as an improvement in GDP growth, because unless you banned private businesses, there's always going to be some people (business owners, independent contractors) working more than 20 hours, so they'd produce more than before, which would show up in GDP.