Japan and the US Yield Curve

Understand why the US yield curve may be about to invert and you've understood a lot IMHO.Brad Setser picks up on the FTs Steve Johnson, and earlier here. Johnson makes one extremely revealing point:"The chief problem for the yen is that the flattening of the US yield curve has made it uneconomical for Japanese investors to hedge their ongoing purchases of US Treasuries, but a falling yen