The slope of the yieldcurve can be measured in varying ways but is conventionally thought of as the long-term government bond rate minus the short-term government bond rate.
Mortgages are bumping along at or near multi-decade lows and a flood of Treasury bond buyers has led to a very appealing yieldcurve for corporate and government borrowers.
His downbeat assessment seemingly interwoven with downright irritation at the mercurial pace of recovery is the latest piece of ammunition for bond bulls looking to exert further downwards pressure on the yieldcurve.