3.2.2.2 Service Unit Example & Picture 3.11 do not fit together

Text speaks about service Y shared by business units A,B,C (C does not use service Y in the picture), service Z to be provided to business unit D (D does not exist in the picture).

Additionally I guess nobody needs this kind of low-level explanation who is reading a book on strategy. I have seen better explanations of value chain / network than this.

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