2.1 Schools of Economic Thought & Core Economic Principles

2.1 Schools of Economic Thought & Core Economic Principles

1. Why Schools of Thought Matter to a Consultant

An investment consultant does not need to settle century-old disputes in macroeconomics. What the CIMA exam requires is the ability to recognize which framework a market narrative is implicitly using, because each school produces a different forecast from the same data — and therefore a different portfolio recommendation.

When an economist argues that a large deficit-financed infrastructure program will raise growth without much inflation, that is a Keynesian claim about slack and multipliers. When another argues the same program will simply raise the price level, that is a monetarist or classical claim about an economy near capacity. Both can cite the same GDP release.

2. Classical Economics: The Baseline

Classical economics — Adam Smith, David Ricardo, Jean-Baptiste Say — holds that markets are self-correcting. Flexible prices, wages, and interest rates return the economy to full employment without intervention.

• Say's Law is the shorthand: "supply creates its own demand." Production generates the income that purchases output, so a general glut is impossible.
• Money is neutral in the long run: changing the money supply changes the price level, not real output.
• Government intervention is unnecessary and typically counterproductive.

Classical thinking dominated until the Great Depression, whose length and depth were difficult to reconcile with automatic self-correction.

3. Keynesian Economics

John Maynard Keynes's General Theory (1936) argued that an economy can settle into a persistent underemployment equilibrium.

Core propositions:

• Aggregate demand drives output in the short run. Prices and wages — especially wages — are sticky downward, so a demand shortfall shows up as unemployment rather than falling prices.
• The paradox of thrift: an increase in desired saving by all households at once lowers aggregate spending, income, and ultimately total saving.
• Animal spirits — waves of confidence and pessimism — drive private investment, which is therefore volatile and not reliably self-correcting.
• The fiscal multiplier means government spending raises output by more than the amount spent, because each recipient re-spends a fraction of the income. With a marginal propensity to consume $MPC$, the simple multiplier is:

$k = \frac{1}{1 - MPC}$

• In a liquidity trap, with interest rates at their effective lower bound, monetary policy loses traction and fiscal policy becomes the primary tool.

Policy prescription: active countercyclical fiscal policy — deficit spending in recessions, surpluses in expansions.

Portfolio implication: a Keynesian diagnosis of an output gap supports expectations of accommodative policy, a steeper yield curve, and cyclical and small-cap equity leadership.

4. Monetarism

Milton Friedman and the Chicago School reasserted the primacy of money while accepting that money is not neutral in the short run.

The framework rests on the equation of exchange:

$M \times V = P \times Q$

where $M$ is the money supply, $V$ is the velocity of money, $P$ is the price level, and $Q$ is real output. Velocity — the average number of times a unit of currency is spent in a period — is the pivot of the whole argument. If $V$ is reasonably stable and $Q$ is determined by real factors, then changes in $M$ pass through to $P$. Hence Friedman's dictum that "inflation is always and everywhere a monetary phenomenon."

Core propositions:

• Monetary policy acts with "long and variable lags," so discretionary fine-tuning tends to destabilize rather than stabilize.
• Therefore central banks should follow a k-percent rule: expand the money supply at a constant rate matched to long-run real growth.
• The natural rate hypothesis holds that there is no exploitable long-run trade-off between inflation and unemployment; attempts to hold unemployment below the natural rate produce accelerating inflation as expectations adjust. This prediction was vindicated by 1970s stagflation, which the then-dominant Phillips-curve framework could not explain.

Portfolio implication: a monetarist reading of rapid money-supply growth argues for inflation protection — TIPS, commodities, real assets, and shorter duration.

5. The Austrian School

Carl Menger, Ludwig von Mises, and Friedrich Hayek developed a framework built on subjective value, dispersed knowledge, and the structure of production across time.

Core propositions:

• Austrian business cycle theory: when a central bank pushes interest rates below the "natural" rate set by genuine time preference, it sends a false signal that society has saved more than it has. Entrepreneurs respond by starting long-horizon, capital-intensive projects — malinvestment.
• The boom is the error; the bust is the necessary liquidation that reallocates misallocated capital. Attempting to prevent the correction with more credit only enlarges the eventual adjustment.
• Hayek's knowledge problem: the information needed to plan an economy is dispersed among millions of participants and communicated only through prices, so central planners and central bankers cannot possess it.
• Deep skepticism of aggregate statistics such as GDP, which mask the underlying capital structure.

Policy prescription: sound money, minimal intervention, and tolerance of recessions as corrective processes.

Portfolio implication: Austrian-influenced analysis favors hard assets, gold, and defensive positioning during prolonged easy-money regimes.

6. Supply-Side Economics

Supply-side economics emphasizes the incentive effects of marginal tax rates on labor supply, saving, and capital formation.

• Lower marginal rates raise the after-tax return to work and investment, increasing potential output.
• The Laffer curve observes that tax revenue is zero at both a 0% and a 100% rate, so a revenue-maximizing rate exists in between. The contested empirical question is which side of that peak an economy currently occupies — the curve itself is uncontroversial arithmetic.
• Deregulation and stable money complement tax policy.

7. Core Microeconomic Foundations

Beneath all schools sit the demand and supply relationships the exam expects candidates to apply.

Price elasticity of demand measures quantity responsiveness:

$E_d = \frac{\%\ \Delta\ \text{Quantity Demanded}}{\%\ \Delta\ \text{Price}}$

This is directly investable: inelastic demand supports pricing power, which is why regulated utilities and consumer staples defend margins in inflationary periods while discretionary retailers cannot.

Other essentials: substitutes (demand for one rises when the other's price rises) versus complements; normal versus inferior goods; diminishing marginal utility, which underpins risk aversion and therefore the concave utility functions used in portfolio theory; and opportunity cost, the value of the best forgone alternative, which is the conceptual basis of the discount rate.

8. Comparative Summary

The modern synthesis. No major central bank is purely Keynesian, monetarist, or Austrian today. The prevailing New Keynesian framework accepts sticky prices and an active stabilization role (Keynesian) while using interest-rate rules, inflation targeting, and expectations management descended directly from monetarist critiques. Post-2008 quantitative easing and the 2021–2023 inflation episode reopened all of these debates: the muted inflation of QE-era balance-sheet expansion strained the simple monetarist link because velocity fell sharply, while the 2021–2022 surge — following money-supply growth combined with supply-chain constraints and large fiscal transfers — gave each school a defensible claim to vindication.