I have been struggling to articulate why I feel quite so concerned about the economy but in a dinner conversation last night I had a kind of Eureka moment. It is now well understood that for at least two decades or so we had economic growth that was fueled (at least in the US) by consumer debt, which in turn was made possible by a housing bubble. Much of the political discussion today seems premised on the idea that once we are done with de-leveraging, households will return to spending and e...