Criticisms to Porter's Five Forces

Although Porter's five forces are generally accepted because it can be proven empirically, there are still some criticisms about it. Let me share you some of these.

Porter's framework has been challenged by other academics and strategists such as Stewart Neill. Similarly, the likes of Kevin P. Coyne and Somu Subramaniam have stated that three dubious assumptions underlie the five forces (http://en.wikipedia.org/wiki/Porter_five_forces_analysis#Criticisms):

• That buyers, competitors, and suppliers are unrelated and do not interact and collude.
• That the source of value is structural advantage (creating barriers to entry).
• That uncertainty is low, allowing participants in a market to plan for and respond to competitive behavior.