So, the two big questions:
Q1: Who controls the interactions between vendor and customer?
Q2: Are the interactions focused on transactions or relationships?
This gives us a universe as follows:
It's important to note that the object of this exercise is most emphatically NOT to "predict" which of these four areas will "win." Instead, it's to draw a vivid caricature of each world, and determine its key traits. Doing this allows us to better plan for, and recognize, instances of that particular scenario when we run across it in the future.
Discussions for the four quadrants
The Global Village
The Matrix (Blue Pill)