Because there is literally no evidence he ever said it. It's a widespread but false attribution, as I outlined in another comment.
https://news.ycombinator.com/item?id=46239664
This attribution leads to a truly fundamentally broken reduction of what Mussolini actually thought fascism was (though his own definition of it was largely pseudointellectual drivel).
But even then, "corporatism" doesn't mean "capitalism" at all.
Because there is literally no evidence he ever said it. It's a widespread but false attribution, as I outlined in another comment.
https://news.ycombinator.com/item?id=46239664
This attribution leads to a truly fundamentally broken reduction of what Mussolini actually thought fascism was (though his own definition of it was largely pseudointellectual drivel).
But even then, "corporatism" doesn't mean "capitalism" at all.