I mean -- one knows about fairly petty fluctuations and anomalies, of course. But the difference between "£30 then = £4,000 now" and the obvious resultant conclusion "∴ £10 then = £1,300 now" -- whence, by analogy, a suitable present for a departing nephew -- is, in Hegelian terms, one of those quantitative differences so striking as to constitute a qualitative difference.

I can't see that any answer so far has explained or reconciled these anomalies I perceive.

≈M≈