Does outsourcing create financial value?

Sometime early next month, I plan to start a series of posts where I'll compare the overall financial value of companies that have outsourced a critical business process or function with a similar firm (in terms of market size) in its industry that has retained core functions in-house. Much like my post on Boeing and Airbus. A pattern should speak fairly conclusively about the financial value of outsourcing.

Oh, I promise not to be biased.