The Phillips Curve for advanced economies from 1996 to 2007 in the United States and Euro area was studied. The researchers found that the traditional form of the Phillips Curve, which shows a trade-off between inflation and unemployment rates, may not always hold true. When inflation and unemployment rates move in the same direction, the Phillips Curve does not follow its usual pattern. It only aligns with expectations when inflation and unemployment rates move in opposite directions in the short-term, or when inflation rises while unemployment remains stable in the long-term.