This is very good. See the other comments for a discussion of the basic argument.
I have 2 issues. The first, and minor one, is that it is probably a little too long. The essential concept is pretty straightforward. The illustrative examples are interesting, but you get the point pretty quickly.
My second issue is that to discount the role of religion in forming inclusive or extractive hierarchies is a mistake. Religion has a massive impact on how societies function and develop (or not). I think the authors were trying to be a little too PC here which is laudable but, in this case, an error.
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Why Nations Fail