"That few in public affairs act from a meer view of the good of their country, whatever they may pretend; and, tho’ their actings bring real good to their country, yet men primarily considered that their own and their country’s interest was united, and did not act from a principle of benevolence.
There are no more uses of "primarily" in the book.
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Did the author mention multiple companies primarily to demonstrate diversity of solutions or to show that interest in the industry is widespread?
The second paragraph is primarily concerned with showing how the colleges are different.