Full Idea
If there were no earlier agreement, how could there be any obligation on the minority to accept the decision of the majority? The law of majority-voting rests on a covenant, implying at least one previous occasion of unanimity.
Gist of Idea
Minorities only accept majority-voting because of a prior unanimous agreement
Source
Jean-Jacques Rousseau (The Social Contract (tr Cress) [1762], I.5)
Book Reference
Rousseau,Jean-Jacques: 'The Social Contract', ed/tr. Cranston,Maurice [Penguin 1972], p.59
A Reaction
In Britain this points to the Reform Acts of 1832 onwards as crucial. However, whenever democracy is newly introduced into a country (Iraq being a current spectacular case) there is usually a minority opposed to it, who are forcibly overruled.