Well, capitalism is great for anyone who can shut his doors, isolate himself from the outside world and still feed and clothe his family. If you have a farm and the skills to work it and can feed and clothe yourself and your family, businesses can't really force you into an unfavorable contract. If you have sufficient money and investments, you're good to go.
The problem with capitalism comes when people need an outside income to be able to sustain themselves. Then you get business owners who tell them that if they don't want to work for starvation wages, there are plenty of others who will. It really is a type of duress.
Capitalism needs to be tempered just enough so that everyone can feel safe in saying "no." to a bad deal. Otherwise, you have a type of de facto slavery.