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This note extends the IS/LM model to incorporate changes in the aggregate price level and to permit output to be determined by aggregate supply and demand. The note introduces the concept of the full employment level of output, provides microfoundations that underpin the aggregate supply curve, and discusses the effects of fiscal and monetary policy when the economy is below and above the fully employment level of output. The note concludes by reviewing the exogenous components of the IS/LM AD/AS model.

This technical note sets the groundwork for a module on macroeconomics by introducing concepts and definitions that will be revisited in subsequent technical notes. The note begins by introducing national income accounting and the components of GDP, and by discussing why economists care about GDP. It then discusses how the determinants of the components of GDP interact on the market, and how we can predict GDP and interest rates through the lens of a model-a framework that maps assumptions into outcomes. The note introduces students to basic economic modeling by walking them through examples of how to determine endogenous variables from systems of equations and exogenous variables. The note concludes by discussing the role of assumptions in macroeconomics and by listing some of the assumptions that we will maintain in subsequent technical notes.

This technical note introduces the basic structure of the workhorse IS/LM model for a closed economy (i.e., one that does not engage in international trade). The note derives the core components of the model and derives predictions of effects of fiscal and monetary policy. The price level is assumed to be fixed, and aggregate demand determines output. This note precedes a more comprehensive treatment of aggregate demand and aggregate supply found in subsequent technical notes.