Premise:
"Fourth, there are those who argue that worksharing discounts are a natural outcome of traditional make or buy decisions."
Hypothesis: Nobody considers worksharing discounts to be a natural outcome.

no

Premise:
"It seems likely that U.S. and foreign mailers would prepare AO mail so that it would qualify for lower domestic rates applicable to printed matter and/or lower priority delivery."
Hypothesis: The U.S. and foreign mailers would likely prepare AO mail.

yes

Premise:
"This is a book in which executives never approve a movie"
Hypothesis: Executives never approve a movie in this book.
yes