Full Idea
For the reductionist, no new causal powers emerge at higher levels, which goes against the claims of the emergentist and the non-reductive physicalist.
Gist of Idea
Reductionists deny new causal powers at the higher level
Source
Jaegwon Kim (Philosophy of Mind [1996], p.232)
Book Reference
Kim,Jaegwon: 'Philosophy of Mind' [Westview 1998], p.232
A Reaction
I would say that all higher level causes are simply the sums of lower level causes, as in chemistry and physics. What could possibly produced the power at the higher level, apart from the constituents of the thing? Magic?