The Five Forces (aka IO Model of Above Average Returns) makes a number of assumptions about the way industries operate. Which one of the assumptions will hold true for virtually every industry? Group of answer choices Most firms have access to similar resources, and pursue the same strategies (whichever is best) Decision-makers are all profit-maximizers Resources are highly mobile across firms (if you have a resource, you can sell it) The external environment affects which strategies yield above-average returns None of these All of these