At the end the worker earns the same, and say we do that with the whole economy and so everything costs twice that much. But workers are generally happier and m

At the end the worker earns the same, and say we do that with the whole economy and so everything costs twice that much. But workers are generally happier and more relaxed. The average worker doesn't earn the same in real terms - that's just not possible in this world. If you have 100 workers producing 100 loaves of bread the average (real) wage is 1 loaf which costs $1. If we adopt your policy the workers produce 50 loaves. The average real wage is now only 0.5 loaves of bread (== $1) but bread costs $2. You can't cut production without corresponding cuts in real wages.