The only reason why I'm giving it 4 stars and not 5 is that the very things criticized in the preface about other mathematical books being like "bitter-tasting medicine", well, Mathematical Economics is pretty much that too. The structure is great: Intro, Exposition, Examples, Economic Application. But frankly I only got through the first two-thirds because I already knew some calculus so I made some sense of the dense text. There's way too much notation for any beginning and possibly intermediate student but perhaps just perfect for the aspiring Ph.D. But then surely they won't need all the intro to calculus stuff. So the book suffers from a serious identity crisis: it's too complicated for simpletons but most of the first half is too simple for boffins. Yet I really liked it and wished I could understand more in it.