Primary and Support Activities
According to Porter, the primary activities
are involved in the physical creation of the product and its sale and transfer to the buyer as well as after-sale service.
The support activities support the primary activities and eachother
by providing purchased inputs, technology, human resources, and various firmwide functions.
You need to disaggregate the 9 activities
to the degree that is relevant for achieving the competitive advantage (differentiation or cost leadership).
Now, competitive advantage can derive from:
1. the primary activities
2. the support activities
3. the linkages among activities (internal linkages
within the firm, and external or vertical linkages
with others firms).