That was not my point. :) I know what this is used for. It's still ill-named (you don't sign it, it would be a "de facto" instead), and still debatable a theor

That was not my point. :) I know what this is used for. It's still ill-named (you don't sign it, it would be a "de facto" instead), and still debatable a theory (which states that in an ideal, invented state of nature, without such a contract enforced by an authority, violence would be the natural relation between individuals). There's more (especially since the times of Hobbes) to describe how societies have functioned/could/should function. Social contract theory is not much more solid than the homo economicus one: it has its points, and its flaws.