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At each point in time, individuals make choices with respect to the acquisition, sale, and/or use of a variety of different goods. Such activity can be summarized by aggregate variables such as an economy's total production of various goods and services, the aggregate level of unemployment, the general level of interest rates, and the overall level of prices.

The focus of this book is on developing simple theoretical models that provide insight into the reasons for fluctuations in such aggregate variables. The models included explore how shocks or 'impulses' to the economy...