"matters which each state is permitted, by the principle of state sovereignty, to decide freely"

answer; not notated (at least, not in the traditional sense) and includes many improvised sections and solos;

answersocial and politcal;

in order to keep competitors from increasing or decreasing the prices they may establish, usa in the period of 70s set very democratic price - abut 1 dollar per gasoline so that their offer will be more affordable and attractive.