Copyright note: if this counts as a work of corporate authorship (surely the publisher owns the copyright not the author...but maybe I'm misunderstanding this definition) this book will enter the public domain in 2107. If it counts as a work of the author then public domain will hit in 2082. This assumes they don't extend it any more.
In either case, it's likely that "highly effective people" will have acquired a number of different habits...but maybe our grandchildren will find interest in the comparison.
Relative to the purchasing options, it's free insofar as the marginal cost is zero.
Yes, technically someone - whether a donor or taxpayers - had to buy the book, construct the building, fund ongoing operations, and so on. But any of your tax money that you might have paid for this is a sunk cost - there's no additional user fee you pay in order to take out Seven Habits (or any other book).
Such a library is considered private, although such libraries may have public access. Public libraries are considered public by virtue of being publicly funded, partially or wholly, via taxes.
Not really. This isn't an exact science - it's just a list of practices that can help a person live a happier and more successful life. A lot of it corresponds to common sense, but the way he explains it drills into the 'why' in very clear language.
In either case, it's likely that "highly effective people" will have acquired a number of different habits...but maybe our grandchildren will find interest in the comparison.