What Macroeconomics Studies
~10 min · Free to read
On March 23, 2020, the US stock market hit its pandemic low. Over the next two months, the unemployment rate jumped from 3.5 percent to 14.7 percent — the sharpest spike since records began. Real GDP collapsed at a 31 percent annualised rate that spring. Then, less than 18 months later, output was back above its pre-pandemic level.
That story isn’t a sequence of personal choices. It’s macroeconomics — the study of the whole economy at once. The same four numbers appear in every news cycle:
US real GDP and the unemployment rate, monthly, 2019 through 2022. The grey band marks the 2020 recession.
Microeconomics zooms in on one person, one firm, one market. Macroeconomics zooms out. The crucial part: the whole is more than the sum of its parts. Sometimes what’s smart for one person sinks everyone if everyone does it at once.
Macroeconomics
The study of the economy as a whole, using aggregate measures like total output (GDP), the unemployment rate, the inflation rate, and interest rates.
Microeconomics
The study of individual decisions — one consumer, one firm, one market. Micro asks how the price of avocados gets set; macro asks why all prices, on average, rise 3 percent a year.
Macro keeps an eye on four big aggregate numbers. Almost every headline you read about the economy is one of these moving:
The four macro vital signs
- Real GDP — the size of the economy, after stripping out inflation.
- Unemployment rate — the share of the labour force who want work and can’t find it.
- Inflation rate — how fast the average price level is rising.
- Interest rates — the price of borrowing money, set largely by the central bank.
When all four are healthy together, the economy hums. When one breaks loose, every model in this course is trying to explain why.
The whole is not just the sum of the parts
If one household saves more, that household gets richer. If every household saves more at once, total spending falls, firms cut production, jobs disappear, and incomes drop. This is the paradox of thrift — what’s rational for one is destructive for all. Macro is full of these aggregation surprises.
Walk through the 2020 COVID recession as a five-step macro story. What shock hit first, what aggregates moved, and how did policy respond?
Step 1: The shock
A health crisis forced shutdowns. People stopped commuting, travelling, and eating out. Aggregate demand fell sharply — millions of households simultaneously cut their spending.
Step 2: Output collapses
With no customers, restaurants, hotels, and airlines stopped producing. Real GDP fell 9 percent in a single quarter (a 31 percent annualised rate). The economy shrank by more in 3 months than it had in the worst year of the 2008 crisis.
Step 3: Unemployment spikes
Firms with no revenue can’t pay wages. Within eight weeks, 22 million Americans lost their jobs. The unemployment rate jumped from 3.5 percent to 14.7 percent — the highest since the Great Depression.
Step 4: Policy response
The Federal Reserve cut interest rates to zero and started buying trillions in bonds. Congress sent stimulus cheques to households, expanded unemployment insurance, and lent to small businesses. The goal: replace the spending that had evaporated.
Step 5: Recovery — and a new problem
By late 2021, GDP was back above pre-pandemic levels. But all that stimulus, combined with supply chain disruptions, lit a fire under prices. Inflation rose from 1.4 percent in early 2021 to 9.1 percent by mid-2022 — the highest in 40 years.
Which of the following is best classified as a macroeconomic question?
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