Why have the economies of southern europe struggled in recent years? select all that apply

The economic problem faced by the countries in Southern Europe, specifically Portugal, Spain, Italy and Greece is due mainly to illiteracy and the low standard of their educational system. Ranking of mastery in mathematics among eighth graders showed that the Southern Europeans come close to the bottom. The lack of education leads to high unemployment and unsustainable standards of living. In Italy and Greece, the other causes are poor business environment and high level of corruption.