A free market would converge to something similar to what we have now. You neglect that people value things other than the amount of short term money to be mad

A free market would converge to something similar to what we have now. You neglect that people value things other than the amount of short term money to be made. People value wage stability more than getting paid their "market rate" and having to constantly apply for new jobs. Employers value the certainty of knowing that they will have competent employees when the get more work. You neglect that a market would be driven by supply (number of people who can reasonably do the job) which is why unpleasant, but quick to learn jobs often pay terrible wages--lots of 3rd world immigrant labor who can learn that work. You also neglect that it generally takes about a year to get adjusted to a new business before you can do much more than follow process that someone gives you (you just don't understand the system level implications yet). If you want employees who can drive innovation and process improvement, they have to have some longevity with the company. You do see many companies moving towards what you suggest where they have core technical teams of employees who oversee/work alongside contractors who do the grunt work.