The vectorial sum of all fears

I haven't posted for a long while, so I'll start with the obvious and depressing.Mondays, Wednesdays and Fridays, the developed world bemoans the fiscal prolems associated with a falling support ratio. "How," they ask, "will economically active people support the children and the elderly with the demographic conditions we expect for 2050?" (handwaved approximation for Europe).Tuesdays, Thursdays