Here's the link to the original, full article by Grantham: http://www.gmo.com/websitecontent/JGLetterALL_1Q11.pdf
A quick perusal shows NO indication that Grantham has any clue that maybe...just maybe...ZERO INTEREST rates and unlimited supplies of Ponzi money and finance provoke ANY affect on human behavior.
I guess the NASDAQ and housing bubbles just didn't register with him?? I guess Grantham thinks that the world reaching 7 billion people and "running out of resources" CAUSED the NASDAQ and housing bubbles?
I have been inclined to suspect peak oil and maybe some other resource depletion as a major issue going forward but when someone like Grantham pounds that drum without even MENTIONING, in an "oh by the way" that ZIRP / Ponzi finance drives people into a consumption and speculation frenzy I have to go back and wonder if maybe he is just setting up ANOTHER red herring similar to "global warming" to sucker more people into his investment vehicles....
I have come to realize that men are not born to be free. Liberty is a need felt by a small class of people whom nature has endowed with nobler minds than the mass of men. -Napoleon