One of the bigger asset bubbles in recent US history has nothing to do with stock, bonds or commodities, and unlike the real estate bust of 2007 (which has since rebounded only for the ultra-luxury segment), barely batted an eyelid during the Great Financial Crisis. Curiously, it was not until early this decade that the institutional money even noticed said bubble, something he discussed in October of 2010 when we profiled TIAA-CREF’s investment in this particular asset class.