Target Market: for the 1 semester principles of macroeconomics course. One of the all time best-sellers, this text is widely used because of its careful, streamlined, and intuitive chapter organization. The Keynesian Cross is an integral part of this text. Case & Fair believe strongly, that a text should use the Keynesian Cross carefully and systematically, to build up to the AD/AS model. One of the great benefits of this approach, is that students won't mistakenly apply what they learned about simple demand and supply to aggregate demand & supply. (A detailed summary of this approach can be found on the page directly following the inside front cover).