The composition of public debt by maturity is irrelevant in the standard New Keynesian model of monetary policy. Nevertheless, central banks have, since the outset of the crisis, purchased large amounts of government bonds in the attempt to support economic activity and stem deflationary...

Federal Reserve purchases of bonds in recent years have meant that a smaller proportion of long-dated government debt has had to be held by other investors (private sector and foreign official institutions). But the US Treasury has been lengthening the maturity of its issuance at the same time....

The financial crisis and subsequent economic recession led to a rapid increase in the issuance of public debt. But large-scale purchases of bonds by the Federal Reserve, and other major central banks, have significantly reduced the scale and maturity of public debt that would otherwise have been...