I can understand why it might seem irrational to some, but only if you compare it too other times in history. This go around, corporations, the central banks of the industrialized nations, big banks and institutions, and the Buffets of the world are BUYERS, even if they have to borrow or issue notes to do it. This is unprecedented in my experience and I've been doing this since 1980, and what also makes this different from any other time in history. The currencies of the world have been made a depreciating liability with real negative rates for the most part, which is why the above mentioned tend not to hold any more cash than is necessary. Valuation generally speaking, is no longer a concern, it's either there is growth or no growth. As long as those mentioned above are buyers, the market will in all probability to continue to trend up.
