Full Idea
When the substratum thesis is grounded on the idea that the ingredients must endure through the change, if they are to play a causal role, then it is natural to suppose that quite a lot of the ingredients must endure.
Gist of Idea
If a substrate gives causal support for change, quite a lot of the ingredients must endure
Source
Robert Pasnau (Metaphysical Themes 1274-1671 [2011], 02.5)
Book Reference
Pasnau,Robert: 'Metaphysical Themes 1274-1671' [OUP 2011], p.33
A Reaction
Aristotle sharply distinguishes alteration from substantial change, but as the substrate gets thinner, the boundary between those two would blur.