Looking at this graph from Olivier Blanchard's 2019 Presidential Address to the American Economic Association, which shows the interest rate on government debt and the nominal GDP growth rate (real growth plus inflation) in the U.S., through time.

A.) What is the historical pattern in these data that Blanchard is trying to draw attention to?

B.) Why does this pattern suggest that the burden of government debt issued today will typically decline over time?

16 14 12 10 8 2 -4 1952 954 195 958 196 Nominal GDP growth and adjusted interest rate 1962 196 1966 1968 1970 1972 1974 1976 1978 Adjusted rate 1980 1982 984 1986 1988 1990 -Nominal GDP growth 1992 1994 1996 1998 2000 2002 2004 2006 2008 10 20 2014 2016 2018