Final answer:
In the NKRE model, the natural rate of interest until time T-1 is r₁∗ and the nominal interest rate is set to zero. In this case, inflation will continuously increase without bound and output will continuously decrease without bound.
Step-by-step explanation:
In the NKRE model, the natural rate of interest until time T-1 is r₁∗, where r₁∗ is greater than 0. From time 0 until time T-1, the central bank sets the nominal interest rate to zero. In this case, inflation will continuously increase without bound, not approaching any fixed value. Output will also continuously decrease without bound, not approaching any fixed value.