Overview -- Money in the utility function -- The welfare cost of inflation in a growing economy -- Government -- More explicit models of money -- Optimal fiscal and monetary policy -- Money and the business cycle: does money matter? -- Sticky prices in a demand-satisfying model -- Sticky prices with optimal quantity choices -- Flexible prices -- Part 2: An introduction to the economics of uncertainty -- Preliminaries -- Does insurance require risk aversion? -- Asset prices and the Lucas' "tree model" -- Part 3: An introduction to uncertain and sequential trade (UST) -- Real models -- A monetary model -- Limited participation, sticky prices, and UST: a comparison -- Inventories and business cycle -- Money and credit in the business cycle -- Evidence from micro data -- The Friedman rule in UST model -- Sequential international trade -- Endogenous information and externalities -- Search and contracts.