[londons_explore]

It's a "paid by the hour" problem.

If, as a company, you pay someone by the hour to complete a task, it's in your best interests to employ only people that do the most work per hour, and then to treat them in a way which gets more work done (to an acceptable quality) per hour.

If instead workers were paid for getting the work done to an acceptable quality, then the workers could decide for themselves what quality of life vs income they wanted.

Salaried work with performance based bonuses are somewhere in between, and perhaps strike a good balance.

[foota]

You probably should also consider that below some productivity it's probably not worth hiring anyone, even if they're willing to be paid very little.