Final answer:
If unemployment is below the natural rate, inflation will be higher than expected.
Step-by-step explanation:
If unemployment is below the natural rate, inflation will be HIGHER than expected. This can be explained by the equation πt - πte = -α(ut - un). The equation suggests that when unemployment is below the natural rate (ut < un), the difference ut - un will be negative. Since the right side of the equation is negative, it implies that the left side (inflation) will be positive, indicating that inflation will be higher than expected.