On 8 November 2008, Paul Davidson and Henry C.K. Liu co-authored an open letter to world leaders attending the November 15 White House summit on financial markets and world economy, urging reconsideration of Keynes' analytical system that contributed to the golden age of the first quarter century after World War II. The letter, signed by many supporting economists, advocates a new international financial architecture based on an updated 21st century version of the Keynes Plan originally proposed at Bretton Woods in 1944.