The empirical developments made by Phillips are at the origin of theoretical orientations highlighting the capacity utilization rate in relation to inflation. It is in this innovative framework that our research whose focus seems to be varied but we tried to concentrate on the comparison between inflation-unemployment relationships through the NAIRU on the one hand, and the inflation-capacity utilization relationship through the NAIRCU on the other hand. Therefore, the degree of asymmetry between NAIRU and NAIRCU becomes particularly important when the economy operates at an unemployment rate far away from the NAIRU or a capacity utilization rate much higher than the NAIRCU.