How is corporate parenting different from portfolio analysis? How is it alike? Is it a useful concept in a global industry?

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https://stud.epsilon.slu.se/4453/1/Andersson_et_al_120703.pdf

 Question 1

How is corporate parenting different from portfolio analysis? How is it alike? Is it a useful concept in a global industry?

 Question 2

What are the tradeoffs between an internal and an external growth strategy? Which approach is best as an international entry strategy?