Macroeconomics — Intermediate

The business cycle

Applying Fundamentals' GDP and unemployment concepts over time: the business cycle describes the recurring pattern of economic expansion and contraction an economy experiences — expansion (rising real GDP, falling unemployment), peak (the high point before growth slows), contraction/recession (falling real GDP, typically defined as at least two consecutive quarters of decline, rising unemployment), and trough (the low point before recovery begins). Understanding the business cycle as a recurring pattern, not a one-time event, is what connects cyclical unemployment (Fundamentals) to the broader macroeconomic picture — cyclical unemployment rises specifically during the contraction phase and falls as the economy recovers.

The Phillips Curve — inflation and unemployment tradeoff

The (short-run) Phillips Curve describes an observed inverse relationship between inflation and unemployment: policies that stimulate the economy tend to reduce unemployment but increase inflation, and vice versa, creating an apparent tradeoff policymakers must navigate. This relationship isn't a fixed, permanent law, however — most modern macroeconomics accepts that the tradeoff largely disappears in the long run (the "long-run Phillips Curve" is often depicted as vertical, meaning monetary policy can't permanently reduce unemployment below its natural rate just by tolerating higher inflation), a genuinely important qualification tested at the intermediate/advanced level, since naively assuming a permanent tradeoff is a common misconception.

Aggregate demand and aggregate supply

Extending Microeconomics' individual-market demand/supply framework to the whole economy: aggregate demand (AD) represents total spending in the economy at each price level (summing the same C+I+G+NX components as the GDP expenditure approach, Fundamentals), while aggregate supply (AS) represents total output firms are willing to produce at each price level. Economy-wide equilibrium occurs where AD and AS intersect, determining the overall price level and real GDP simultaneously — a demand-side shock (say, a fall in consumer confidence reducing consumption) shifts AD and affects both price level and output, while a supply-side shock (say, a spike in oil prices affecting production costs economy-wide) shifts AS instead, with different implications for the inflation/output tradeoff than a demand shock would produce.

Demand-pull vs. cost-push inflation, applied to AD-AS

Fundamentals introduces demand-pull and cost-push inflation as distinct causes; Intermediate maps them onto the AD-AS framework directly: demand-pull inflation corresponds to an outward shift of AD (more spending at every price level, pulling the price level up as the economy approaches capacity), while cost-push inflation corresponds to an inward shift of AS (higher production costs meaning less output is offered at every price level, pushing the price level up even as output falls) — this AS-shift mechanism is specifically why cost-push inflation is harder to address, since it can coincide with falling output and rising unemployment simultaneously (a combination sometimes called "stagflation"), a scenario standard demand-management policy struggles to address without worsening one problem while fixing the other.

Multiplier effect — why fiscal policy has amplified impact

An increase in government spending (a component of AD) doesn't just add its own value to GDP — it triggers a multiplier effect: the initial spending becomes income for someone, who then spends a portion of that additional income, becoming income for someone else, and so on, meaning a given fiscal stimulus can produce a total GDP increase larger than the initial spending amount. The multiplier's actual size depends on how much of each additional rupee of income gets spent rather than saved (the marginal propensity to consume) — this concept directly underlies Advanced's coverage of fiscal policy's practical effectiveness.