Sure.
The real effect of the program was to increase parents' disposable income. That means that parents must then decide whether they want to spend the money, save it, or use it to pay down their debts. We projected that parents would choose to spend a little and save a little, and that is exactly what we observed.
However, we were surprised to see the effect was much more concentrated in time than we would have thought. This kind of change increases income levels once, but it continues to another level. The effect on the level of consumption is permanent, but, unless the amount continues to increase, the effect on growth disappears. That is the basic arithmetic of growth.
In a nutshell, a one-time increase in income level is very positive, but it cannot continue if the amount of the increase remains the same.