This is at heart, a 1970s neo-classical textbook and is far from light reading.
I seriously thought about giving fewer stars because the book is chalk full of mathematical exercises and formulas, and 1970s graphs with 1970s graphics makes it at times difficult to follow. It claims to be an 'introduction' but a high level of economic and mathematical knowledge is required. Maybe students in the 1970s were more prepared than today, or maybe the 'introduction' to neo-classical macroeconomics presupposes a solid knowledge of Keynesian macroeconomics and microeconomics.
But in the end, the book is readable, just like kale is edible. It isn't always easy or pleasant but in the end the reader is better off for having chewed through it.
The book begins with a deconstruction of classical (Malthusian) economics and then introduces the neo-classical growth model. (Neo)-Keynesian economics is used as a foil throughout to show how the neo-classical models better describe and predict certain economic activities.
Neo-classical macroeconomics is really microeconomics on steroids. The authors start by building up a model (which has little semblance to anything in the real world) and gradually keep adding details, clarifications and additional information until it begins to resemble a 1970s Frankensteinish world.
But here is the rub...it is a 1970s world. Much of the discussions on savings, investing, taxation, debt, and monetary policy are firmly rooted in the 1970s political and economic landscape. Naturally the authors cannot be blammed for that, but along with the more basic beginning of computer modelling, the textbook is dated.
One thing the textbook does predict correctly is the rise and fall of the Phillips Curve and it straddles the worlds of Modigliani and Friedman nicely.