Introduction

This course explores core topics in macroeconomics, including national statistics, consumption and saving, unemployment, inflation, business cycles, monetary and fiscal policy, economic growth, and population dynamics. The course discusses short-run and long-run economic fluctuations in the United States and abroad. It also presents models describing such fluctuations: the IS-LM model of business cycles, the matching model of unemployment, models of inflation, the Malthusian model of preindustrial growth, and the Solowian model of modern growth.

Introductory slides

  1. Overview of macroeconomics

Introductory reference

  • Akerlof (2002) – This essay discusses macroeconomic models and their assumptions, and it isolates six macroeconomic phenomena that macroeconomic models should be able to explain.

Macroeconomic concepts

This section introduces key macroeconomic concepts: gross domestic product (GDP), inflation, and unemployment.

Lecture slides

  1. The world
  2. Defining GDP
  3. GDP over Time
  4. Composition of GDP
  5. Inflation
  6. Unemployment

References

  • Kuznets (1934) – This report produces the first estimates of GDP in the United States.
  • Kuznets (1952) – This paper measures GDP in the United States between 1869 and 1948.

Homework


IS-LM model of business cycles

This section presents the IS-LM model. Its goal is to explain the fluctuations of GDP observed over the business cycle. The model is also useful to understand the effects of monetary and fiscal policy.

Lecture slides

  1. Expenditure function
  2. IS submodel
  3. LM submodel
  4. OMO, ZLB, and money multiplier
  5. IS and LM curves
  6. Recessions
  7. Monetary and fiscal policy

References

  • Hicks (1937) – This paper builds the IS-LM model from Keynes’s General Theory.
  • Krugman (2018) – This essay argues that the IS-LM is still good enough for policy work.

Homework


Matching model of unemployment

The IS-LM model does not feature unemployment, which is problematic because high unemployment is the most costly consequence of recessions. To explain the existence of unemployment and the fluctuations of unemployment over the business cycle, this section develops a matching model of unemployment.

Lecture slides

  1. Matching function
  2. Labor supply
  3. Labor demand
  4. Wages
  5. Equilibrium of the matching model
  6. Labor-market policies
  7. Unemployment types

References

  • Michaillat (2012) – This paper shows how to introduce job rationing into a matching model of unemployment. It also shows that a mild amount of wage rigidity is sufficient to generate realistic fluctuations in unemployment over the business cycle.
  • Landais, Michaillat, Saez (2018) – This paper develops a static matching model of unemployment. It represents its equilibrium with labor demand and supply curves in an employment-tightness plane.

Homework


Models of inflation

This section introduces the Phillips curve and discusses fluctuations in inflation over the business cycle. It also briefly presents the quantity theory of inflation and discusses episodes of hyperinflation.

Lecture slides

  1. Phillips curve and quantity theory

References

  • Phillips (1958) – This paper discovers a negative relation between unemployment and wage inflation in the United Kingdom.
  • Samuelson, Solow (1960) – This paper discovers a negative relation between unemployment and price inflation in the United States. (It also finds a negative relation between unemployment and wage inflation in the United States.)

Homework


Malthusian model of growth

Moving away from short-run, business-cycle fluctuations, this section turns to long-run macroeconomic fluctuations. It describes long-run fluctuations in the preindustrial period using the Malthusian model of growth.

Lecture slides

  1. Overview of the Malthusian model
  2. Population
  3. Output per worker in the Malthusian model

Reference

  • Ashraf, Galor (2011) – This paper describes fluctuations in population and output per worker in the preindustrial era. It then develops the Malthusian model of growth to explain these observations.

Homework


Solowian model of growth

This final section describes long-run fluctuations in the modern, industrial era using the Solowian model of growth.

Lecture slides

  1. Production and saving
  2. Output per worker in the Solowian model
  3. Golden rule
  4. Technological progress
  5. Balanced growth

Reference

  • Solow (1956) – This paper develops the basic Solowian model of growth.
  • Solow (1957) – This paper adds technical progress to the Solowian model of growth.

Homework