NAIRU
The non-accelerating inflation rate of unemployment (NAIRU) is a theoretical level of unemployment below which inflation would be expected to rise. It was first introduced as the NIRU (non-inflationary rate of unemployment) by Franco Modigliani and Loukas Demetrios Papademos in 1975, as an improvement over the "natural rate of unemployment" concept, which was proposed earlier by Milton Friedman.