In what ways are wages and taxes different, from the perspective that both of them are costs on a business? Aren't they both liabilities?
Why are you convinced, apparently, that a business could expend extra in wages with no effect on its prices, while a similar added expense for supplies or taxes would have an ill effect?
SD
A restaurateur may do whatever he wishes with the renumeration to his workers. It's up to him to govern himself. He may not do what he wishes with the taxes.
If he pockets the difference between any other type worker's compensation and that he pays his serving workers, the difference being paid by his customers directly, and the cost of his prepared food is not affected by the difference, and yet he raises the price of his food to make up that customer paid difference to keep the cash flow, he has a greed problem. That problem is totally dependent on his willingness to self-govern.
No law should be passed. There is already spiritual law that covers that behavior and intention.