Since even the govt orgs and economists have no good ideas on GDP growth to 2081 (!) - I'd suggest to look instead at the interests these groups represent: Krug

Since even the govt orgs and economists have no good ideas on GDP growth to 2081 (!) - I'd suggest to look instead at the interests these groups represent: Krugman loves govt safety nets, SSA wants SS to look viable long term, the CBO looks at problems that may or may be occurring. To say "GDP is obviously growing more than that" (especially while the world is in a deep structural recession) is a similar argument to Republicans pointing to sunspot activity and saying ("so theres no CO2 problem!") while ignoring all other data on climate change.