I understand the principles indeed. But the fact remains that individuals can decide not to sign any contract. In a world without centralised governments; These do have all the rights one can possible have; These individuals can so anything they please since they have no contract with anybody else. Therefore I actually think it is impossible to live with such an amount of people on our planet without some centralised or semi-centralised 'governments' (I quote governments, since these maybe different to what we have implemented today).