A common explanation for low Treasury yields is that low rates outside the United States have piled into the U.S. market, as investors in Europe, Japan and elsewhere look to the United States for a reasonable mix of safety and yield.
That is part of what Gavyn Davies, in one of his typically thoughtful posts, argues that the Fed has learned over the past year. The United States is no longer a (monetary) island, the rest of the world matters. Of course, what Lael Brainard called the elevated sensitivity of exchange rate moves to monetary surprises is also a part of the global story. It isn’t just a flows story. An awful lot of the tightening in U.S. financial conditions that occurred in anticipation of the Fed raising rates came through dollar appreciation; too much in my view.
The apparent problem with this the “foreign demand is holding down Treasury yields” thesis: Foreign investors pretty clearly have sold Treasuries over the past 12 months. And not just a few Treasuries. Net foreign sales of long-term Treasuries over the last 12 months of data are around $250 billion.
So what is going on?
It is actually pretty simple, in my view. Treasury sales in the Treasury International Capital (TIC) data (and also, I suspect, most of the sales of U.S. equities) are linked to the fall in global reserves.
Over the last 12 months China has sold several hundred billion of reserves (though most of those sales were in the fall of 2015 and early 2016, recent sales are more modest), the Saudis have been selling and Japan—for reasons of its own—has been selling securities while increasing its deposits (Japan has reduced its long-term securities holdings by a bit over $100 billion over the last two years, while raising its short-term deposits by a similar amount, according to the SDDS data).