The fact that a group of students slips into the subway network without paying, in protest against the rise in ticket prices, should not lead to a constitutional reform. Except in the case of Chile, of course.. The South American country, a narrow strip of 3,000 kilometers compressed between the cold of the Pacific and the walls of the Andes, this weekend takes a key step for its political reform: the election of 155 constituents to draft a new Magna Carta. It is, in the context of the explos