The rate that moves with time

An isolated pair's utilization sits inside its target band for a week. What happens to its full-utilization rate?

• It drifts up slowly, because the pair is in use
• It stays where it is
• It drifts back toward the zero-utilization rate

A pair's full-utilization rate rises. What happens to its vertex rate?

• It rises too, because it is set as a share of the gap between the zero-utilization and full-utilization rates
• Nothing, because the vertex is fixed at deployment
• It falls, to keep the average rate steady