However, in the 1970s and 1980s, when stagflation occurred, it became obvious that the relationship between inflation and employment levels was not necessarily stable: that is, the Phillips relationship could shift.
但在1970年代及1980年代，當滯漲出現時，明顯地通漲與就業水平的關係並不平穩，也就是說菲利普斯關係可以位移。