So why don't corporations use markets themselves?

Like most unrepentant lefties, I get tired of hearing people talk about markets as though they we some kind of panacea rather than the combination of adolescent abstraction and crooked game they obviously are to anyone who bothers to work out how they really operate.

But just to cut through the usual theological speculation (which would, I am quite sure, have shocked Adam Smith, who seems to have been generous, humane and sophisticated moral philosopher who distrusted business deeply), would someone please point me at, say, three major corporations that organise their own internal operations as a market?

Can't think of even one? Me neither.

But worst of all, they won't solve our current environmental or energy problems. Why not? Because of this.