The problem is fairly simple. The actual output of society is produced by a relatively small minority of skilled individuals that are not easily replicable (ie fungibility is largely a myth). We need those people to work a full week operating the machines that actually make all the output we all consume. But why should they do that if nobody else is working? They could just make enough for the small set of people tha…
Reward for the extra day worked? If top performers are rewarded more than everyone else and working the extra day or two is optional,everyone else can opt to not work the rewardless extra day while top performers opt to work a full week for the reward.
It's much like competitive shift jobs for waiters, the good performers get the hard well tipping shifts.
Does this simply not work at scale?