Slavery was (is) also an agreed upon social contract, enforced by various means. What makes it wrong? You clearly have morally prescriptive beliefs. Why are you so sure that your moral prescriptions are the right ones? And that being in the majority gives you the right to impose your beliefs on others?

What if you are in the minority? Do you just accept the hypercapitalist dictates of the majority? Why not?

Law is more than convention. What distinguishes legitimate from illegitimate law?

The only way for people who disagree axiomatically to get along is to impose on each other minimally.