>If everyone pays higher wages, there's a greater supply of money for buying stuff / solving problems (assuming the higher wages aren't eaten by rents). No individual form recoups all of the higher wages they pay their workers, obviously, but there's a larger market for the goods of everyone has more money.

Does this actually work? Suppose you're on an island where the economy only produces coconuts. How does giving workers more coconuts make the economy grow, such that there's more coconuts to go around overall? Unless the workers were absolutely famished, giving them more coconuts isn't going to increase productivity. You might argue this model isn't representative of the real world, but that's approximately how the economy works. It can produce a certain amount of "stuff" (ie. coconuts), of which some portion can be given to workers, and the remainder can be given to the kings/elites/capitalists/whatever. Unless you improve productivity, there isn't going to be magically more stuff to go around.

Giving each worker a car can plausibly increase their productivity (less time spent commuting?) but the effect is small, and unlikely to be recouped by car companies. The situation looks even worse in the current economy. If everyone's paychecks were 10% bigger, what marginal item do you think it'll be spent on? A bigger car? A new iPhone or big screen TV? How would any of those increase productivity?

Is there? Covid stimulus would say there isn't. Granted a company raising wages doesn't print money out of air like the Fed but the amount of goods doesn't change, the cost of the goods adjusts to the monetary supply. You now pay more for the same.