Is 9c misplaced? 'Provide information that is useful in and of itself. This includes journalism and creative writing'.
The author has already listed knowledge of how to do any of the other mechanisms more efficiently and effectively (9a).
In what sense is non-instrumental knowledge a fundamental source of wealth? It might be exchanged for wealth, but it is not a form of wealth itself. It is a different paradigm of activity. The author's use of the adjective 'useful' here is surely a misnomer, too.
It's also notable that one of the fundamental forms of wealth accumulation historically - different ways of securing and organising the labour of other humans - is excluded from the list.