In Schumpeter's view, the division between statics and dynamics is much more than methodological.
Progress, then, is not a "natural" fact, but a methodological one.
If they turn out to be false, candour compels us to call them methodological fictions; but they continue in use.
Hence these principles carry their recommendation directly in themselves, and not merely as methodological devices.
That this is a methodological device no one denies, but so are most of the other distinctions that we frame.
A big part of the difference is methodological, rather than inherent in the nature of the phenomena themselves.
The dominating trend of this movement was logical rather than methodological.
But this, quite obviously, is merely a methodological precept, not a law of Nature.
The case of methodological assumptions is more difficult and instructive, and is usually misconceived.
There was in this a methodological rule, a very natural rule—so natural, indeed, that it was not even necessary to formulate it.