THOSE unconvinced-and those seeking to unconvince others-of the reality of man-made global warming often point to the changeable behaviour of the sun as an alternative hypothesis.
It could be because of greater natural variability in the climate, because clouds dampen warming or because of some other little-understood mechanism in the almost infinitely complex climate system.
For these reasons perfect stability of prices is impossible in an economy subject to change-unless, indeed, there is some peculiar mechanism which ensures temporary fluctuations of just the right degree in the propensity to consume.