Part V — Macroeconomic Foundations
What is "the economy" and how do we measure it?
Macroeconomics is the study of the whole — total output, total employment, total prices, total growth. It asks different questions from microeconomics: not "what is the price of bread?" but "what is the price level, and is it rising or falling?" Not "is there a shortage of nurses?" but "what is the unemployment rate, and what does it mean?" Not "should this firm produce more?" but "is the country growing? If so, why? If not, why not?"
The four chapters in Part V are the macro foundations. By the end of the part, you should be able to read a GDP report, a CPI release, and a jobs report — and you should have the basic framework for thinking about why some countries are rich and others poor.
Chapter 22 — Measuring the Economy: GDP walks through gross domestic product from both the expenditure side (C + I + G + NX) and the income side. Real vs. nominal. The GDP deflator. What GDP captures (market production) and what it misses (unpaid household labor, environmental costs, distribution, leisure, much of the digital economy). Alternative measures: the Human Development Index, the Genuine Progress Indicator, life-satisfaction surveys. The chapter uses the COVID economy as the anchor — GDP fell harder and recovered faster than any postwar recession, and the recovery looked very different on different metrics.
Chapter 23 — Inflation and the Cost of Living walks through how the Consumer Price Index is constructed, the three biases in its measurement (substitution, new goods, quality), and the difference between core and headline inflation. The chapter explains why people's lived experience of inflation often diverges from the official rate, and walks through the costs of both inflation and deflation. The 2021–23 inflation episode is the anchor — three honest explanations (supply-chain shock, demand stimulus, expectations) that all have evidence behind them.
Chapter 24 — Unemployment is the chapter that teaches you to read a BLS jobs report. The chapter distinguishes frictional, structural, and cyclical unemployment, introduces the concept of the natural rate, and walks through what the unemployment rate captures and misses. Long-term unemployment is qualitatively different from short-term, and the chapter takes hysteresis seriously. The 2008 Great Recession (cyclical), the COVID recession (uniquely shaped), and the closing of a Riverside Foods production line in Millbrook (structural and frictional combined) are the running examples.
Chapter 25 — Economic Growth is the chapter that asks the most important question in economics: why are some countries rich and others poor? The chapter introduces the Rule of 70, walks through the production function intuitively (with the Solow model in an advanced sidebar for interested readers), and presents the four sources of growth (physical capital, human capital, natural resources, technology). Then institutions — Acemoglu and Robinson's "Why Nations Fail" thesis — and the East Asian miracle, sub-Saharan Africa's growth challenge, Botswana's success, and Argentina's tragic de-development.
When you finish Part V, you can read economic news with new eyes. The next two parts will teach you what governments and central banks do to influence the variables you have just learned to measure.