When the economy breaks, should anyone fix it? Three famous schools give three different answers, and your crew has probably argued all three already without the names.
Learning objectives. After this week you can (1) state the core claim of the classical, Keynesian and monetarist schools; (2) use the quantity equation MV = PQ; and (3) argue one shock from more than one school.
Remember this: classical says the economy heals itself. Keynesian says it can get stuck, so push. Monetarist says follow a steady rule, because fixes arrive late.
1) Classical: markets self-correct
The classical school holds that prices and wages are flexible: after a shock, they adjust and output returns to potential on its own. Policy advice: mostly hands off (laissez-faire). Evidence for it in your season: indicators that drift back toward normal after a shock with nobody stepping in. The catch is time. Keynes's famous reply: in the long run we are all dead.
2) Keynesian: demand fails, wages stick
Keynes argued that wages and prices are sticky, especially downward, so a collapse in demand can leave the economy below potential for years. Policy advice: manage demand, with deficit spending and easy money in slumps. Evidence for it: Week 12's wages that rise easily and fall slowly, and the loop where layoffs cut spending and spending cuts cause layoffs.
3) Monetarist: rules, not fine-tuning
M × V = P × Q (money × velocity = price level × real output)
Milton Friedman's monetarists said inflation is always and everywhere a monetary phenomenon, and that policy works with long and variable lags, so fine-tuning often lands late. Better a steady, predictable rule. If money grows 8% while velocity and output hold steady, prices rise 8%. If real output also grows 3%, inflation is about 8 − 3 = 5%.
4) One shock, three prescriptions
| Confidence crashes 20 points | Diagnosis | Prescription |
|---|---|---|
| Classical | Temporary; recovery is underway | Protect solvency and let it heal |
| Keynesian | Demand failure that can feed on itself | Act now: discounts, marketing, credit |
| Monetarist | Real shock, but fixes land late | Follow the rule set in advance |
The 1970s brought stagflation, rising prices with rising unemployment, from negative supply shocks. Pure demand theory couldn't produce both at once, which broke the simple Keynesian consensus. Rational expectations theorists added that people anticipate systematic policy, which blunts it. Modern central banking blends all three: Keynesian in slumps, monetarist about rules, classical about the long run. The schools disagree most about whether and how fast to manage demand; all three agree supply shocks are a genuine dilemma.
Quick self-check
(a) Money +10%, velocity and output flat. What does MV = PQ predict for prices? (b) "Do nothing, it will drift back on its own" is which school? (c) What did 1970s stagflation challenge? (Answers: +10%; classical; the simple Keynesian consensus.)
Common mistakes
- Treating schools as team jerseys. They are models, each right in some conditions.
- "Classical means never act." It means self-correction usually beats a late fix.
- Forgetting the common ground. All three agree supply shocks are hard.
This week in the arena
Find the biggest drop in consumer confidence across your reports so far. Write one sentence for how each school would explain what happened next, using your own revenue numbers from those days.