The availability of television reduces the amount of reading children do  When television is made unavailable, a nearly universal increase in reading, both by parents and by children, is reported
When television is available again, the level of reading by both parents and children relapses to its previous level
Whenever the money supply in an economy fluctuates, interest rates tend to fluctuate. When the money supply remains constant, interest rates tend to remain stable. Thus, the money supply's remaining constant stabilizes interest rates.