Additional point: suppose that phenomenon X at time t+1 is "somewhat different but in other respects the same" at at time t. We are likely to say that the change in X is a quantitative change in some component variable. But the problems start when the change actually consists of a (small) qualitative change. The problem with historical change is, typically, that both quantitative and qualitative changes are occurring at the same time, and thus that any measurement or comparative exercise is forced to make some abstractions. And they could be forced abstractions, which actually do little justice to the actual process.
J.
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