Rather, for all objects and experiences, there is a quantity that has optimum value. Above that quantity, the variable becomes toxic. To fall below that value is to be deprived.

It is impossible, in principle, to explain any pattern by invoking a single quantity.

If we pursue this matter further, we shall be told that the stable object is unchanging under the impact or stress of some particular external or internal variable or, perhaps, that it resists the passage of time.

To be is to be the value of a variable.

That is about average for a recovery. It's above the recovery we saw in the early '90s, but significantly below the recovery we saw in the early '80s. So it's a very sort of plausible forecast.

They're above the tracks and we're below the tracks.