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From the Preface:
We have designed this book to be a supplement to Robert J. Barro's
Macroeconomics,
which is the textbook that is used in introductory macroeconomics
courses at the University of Chicago.
In teaching these courses,
we have found that Barro's treatment of the subject does not
make use of the mathematical skills of our students.
In particular,
Barro relies almost exclusively on economic intuition
and graphs to elucidate his subject.
Since our students are familiar with calculus,
we are able to work out formal models.
This almost always allows greater concreteness and concision.
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