Arnold Kling over at Econlib has been saying for years that there's more (or less if you prefer) to current economic woes than just a shortage of aggregate demand. We're going through a period of quite rapid economic change (the internet is only part of it, the container ship and thus globalisation is perhaps more important) and this leads to restructuring. And restructuring simply takes time as we all scratch our heads and try to work out what to build as our new model to replace the old.