Designed for Macroeconomics courses where early, distinctive coverage of the micro-foundations of macroeconomics is important, this new text provides a balanced and accessible presentation both of equilibrium and Keynesian macro models. The author avoids the "dueling model" mode which some books promote; instead, these models are presented as a variation on a single unified theme. This approach helps students to see and understand the relationship of these models to one another and to on-going attempts to realistically model macro forces.