At the point where actual inflation is equal to expected inflation

The short run Phillips curve intersects the long run Phillips curve.

Explanation: The Phillips curve states that unemployment and inflation have an inverse relationship. This means that they move in opposite directions, I.e. If inflation increases then unemployment decreases and vice versa.

In the graph attached the short run Phillips curve is L - shaped and shows the inverse relationship between both variables initially. The long run Phillips curve is a vertical line, and shows that unemployment rate remains steady regardless of inflation rate, in the long term. Where these 2 lines intersect is where actual inflation and expected inflation are the same.