You are assuming that companies somehow hold more power in negotiating with their employees. But it's not at all clear to me that that's the case. Both parties

You are assuming that companies somehow hold more power in negotiating with their employees. But it's not at all clear to me that that's the case. Both parties are able to walk away from negotiations and fulfill their needs with other parties. There is a symmetry there that speaks against there being any power imbalance. What is the mechanism by which you think companies wield more power than employees?