>it stand to reason that a worker can produce only so much work per day before stressing out, and if an employee hired for 8h does 4h more on the side as contra

>it stand to reason that a worker can produce only so much work per day before stressing out, and if an employee hired for 8h does 4h more on the side as contractor the employing company gets 'cheated out' of productive time and this is especially true in a job that require fairly constant concentration, even if being tired at the job is shitty all around universally. Even if there is truth to what you said, employers already have enough power as it is. Why should we let them own a workers time even outside of the hours they are being compensated? They have no right to that. At the end of the day, if a worker is not productive enough the company can choose to fire them - thats about all the say a company should have over your life. If they want to OWN ALL your productive output, it stands to reason they should pay much more than the 8 hours your salary covers.