Nonstochastic Macroeconomics: The Keynesian Model. Tobin's Dynamic Aggregative Model. Dynamic Analysis of a Keynesian Model. Introduction to Stochastic Macroeconomics: Implicit Labor Contracts and Sticky Wages. Difference Equations and Lag Operators. Linear Least Squares Projections (Regressions). Linear Stochastic Difference Equations. Investment Under Uncertainty. Dynamic Optimal Taxation. The Phillips Curve. Optimal Monetary Policy. Aspects of the New Classical Macroeconomics.