I often wonder why companies don't pay more in order to hire more productive employees.
The local Costco has checkout folks who can scan and bag items 2x-5x faster than I get at local grocery stores even when I only have a relatively small number of items, and they do a better job at packing items in to not damage them, are friendlier, etc.
Because almost no one tries to pay for better employees, the market isn't competitive and these people don't cost 2x let alone 5x.