ABSTRACT
Every political system must have legal rules that are at the same time sufficiently flexible and sufficiently rigid. They must be sufficiently flexible so that laws can be adapted to their changing context (new problems, technological development, international obligations) and can reflect the changing will of the people expressed at periodical elections and the governments installed by those elections. They must also be sufficiently rigid so as to allow for the stability and legal certainty which citizens, firms and administrative authorities need, and also in order to prevent passing political majorities from abusing their power to threaten fundamental values of the nation.
