Full Idea
In general, concepts that are used when we categorise and concepts that are used when we reason inductively could have little in common.
Gist of Idea
Concepts for categorisation and for induction may be quite different
Source
Edouard Machery (Doing Without Concepts [2009], 3.2.1)
Book Reference
Machery,Edouard: 'Doing Without Concepts' [OUP 2009], p.58
A Reaction
In the end he is going to reject concepts altogether, so he would say this. Friends of concepts would be very surprised if the mind were so uneconomical in its activities, given that induction seems to be up to its neck in categorisation.