In this case, they are giving the boss a higher value than they are receiving from the boss

Well of course, because a business has more expenses than just paying the worker. Material needs to be paid, taxes, insurances etc. If the worker would receive the full value for his production, the company would lose money and go bankrupt within months.

They are exchanging their labour and the finished goods in exchange for two items the boss has a monopoly on: money

Your train of thought has a gap. The boss has no monopoly on money. The customer has. He's the one that buys or pays something. The boss is, more or less, at the mercy of his customers. This is less of a problem if the boss sells something that is crucial to your life, like food, water, housing etc, so things you really need to survive, but a big problem if you sell something that isn't.

That's why I usually say that we as society absolutely have the power to decide which companies live an die. We just don't work together and use that power.