A rise in the level of saving can reduce aggregate activity temporarily but only a sustained high level of saving makes it possible to have the sustained high level of business investment that contributes to the long-run growth of output.

He is among the 10 most influential economists in the world according to IDEAS/RePEc. A. In March 2007 the Lynde and Harry Bradley Foundation announced that one of four 2007 Bradley Prizes to honor outstanding achievement would be awarded to Feldstein.

Martin Stuart "Marty" Feldstein (born November 25 1939) is an American economist. He is currently the George F. Baker Professor of Economics at Harvard University and the president emeritus of the National Bureau of Economic Research (NBER).