Final answer:
The natural rate of unemployment refers to the level of unemployment that exists when the economy is in a state of equilibrium. Additional information is needed to determine the natural rate of unemployment in the given context.
Step-by-step explanation:
The natural rate of unemployment refers to the level of unemployment that exists when the economy is in a state of equilibrium, with no cyclical or temporary factors affecting the unemployment rate. It represents the unemployment rate at which inflation remains stable over time. In the context of the given Phillips curve equation πₜ =πₜᵉ +0.08−2uₜ, the natural rate of unemployment is not explicitly mentioned. You would need additional information to determine the natural rate of unemployment.