Against the background of finite fossil fuels, impacts of climate change, and risks of nuclear energy, the far-reaching transformation of energy systems is essential, but also implies risks and undesired directions, e.g. electricity grid overloads, unaffordability, acceptance problems, or still...

During the first decade of this century, Germany saw a radical transformation of its old age security system. The coalition of social democrats and the green party transformed the traditional German pension system into a three-pillar-system and reduced the generosity of the pay-as-you-go-pillar....