IB Marcoeconomics

IB Economics Essay Structure (KAAE)

Knowledge: define terms precisely. Application: embed specific real-world examples or extracted data. Analysis: construct rigorous economic chains detailing how event X triggers result Y. Evaluation: challenge underlying assumptions, expose implementation flaws, and assess short-run versus long-run policy impacts.

Scarcity and Choice in Macroeconomics

Unlimited human wants collide with finite economic resources. Central planners and free markets must prioritize competing macroeconomic objectives, generating unavoidable trade-offs.

Circular Flow of Income

Examines continuous flows of money, resources, and output between households and firms. TLDR: Households own the factors of production (land, labor, capital, enterprise) and supply them to firms in exchange for income (wages, rent, interest, profit).

States of Disequilibrium in the Circular Flow of Income

• Injections Exceed Leakages (J > L): National income rises, and the economy grows because total spending exceeds total output capacity.

• Leakages Exceed Injections (L > J): National income falls and the economy contracts as more money exits active circulation than enters.

Gross Domestic Product (GDP)

Total market value of all final goods and services produced within a nation's borders over a specific time frame. Measures local production regardless of factor ownership.

Gross National Income (GNI)

Total income earned by a country's citizens and domestic corporations, regardless of geographic location. Calculated as GDP plus net factor income from abroad.

Distinction Between GDP and GNI

GDP tracks output within physical borders, whereas GNI measures income ownership. Massive profit remittances by foreign multinationals leave developing host nations with high GDP figures but significantly lower GNI.

Nominal GDP vs Real GDP

Nominal GDP uses current market prices, distorting figures with price inflation. Real GDP adjusts output using constant base-year prices to isolate actual physical output growth.

GDP Deflator Formula

Measures price changes across all domestically produced goods and services in an economy.

Real GDP Calculation

Strips out inflationary distortions to compute true economic expansion.

Green GDP

Environmental output metric calculated as Green GDP = GDP - Environmental Costs. Deducts natural resource depletion and environmental degradation costs from standard output.

Purchasing Power Parity (PPP)

An exchange rate adjustment pricing a uniform basket of goods across different currencies. Equates actual local purchasing power across international boundaries.

Rationale for Using PPP

Market exchange rates fluctuate wildly based on currency speculation. PPP removes currency distortions, enabling realistic cross-border living standard comparisons.

PPP Limitations

Comparing identical consumer baskets across diverse cultures fails when spending habits differ wildly. Quality variations between nations further skew price accuracy.

Limitations of GDP for Living Standards

Ignores income inequality, unrecorded informal labor, domestic work, pollution, and working hour stress. GDP tracks market volume, not human happiness.

Wealth vs Income

Wealth represents a accumulated stock of physical and financial assets measured at a single moment. Income reflects a dynamic flow of money earned over a specific period.

The Wealth Effect

Surging asset values elevate perceived household wealth, driving up private consumption ($C$) without any immediate increase in disposable income.

Evaluation of the Wealth Effect

Distributes gains unequally. Property spikes enrich existing asset holders while punishing renters, failing to drive uniform national spending.

Base Year

A reference year assigned a benchmark index value of 100. Allows economists to measure price index and output variations over time.

Index Number Calculation

Expresses changes in a variable relative to a baseline level used to track macroeconomic trends, such as inflation, as measured by the Consumer Price Index (CPI).

Business Cycle Phases

The short-term, recurring upward and downward movements in real GDP are driven by changes in aggregate demand and aggregate supply, forming a long-term growth trend.

Business Cycle Diagram Axes

Vertical Axis: Real GDP. Horizontal Axis: Time. Tracks output deviations from potential trend lines over time.

Circular Flow Equilibrium Condition

Equilibrium requires total injections to equal total leakages (I + G + X = S + T + M).

Aggregate Demand (AD)

Total spending on domestic goods and services at a given price level over a specific period. AD = C + I + G + (X - M).

Determinants of Consumption (C)

Disposable income, commercial borrowing interest rates, consumer confidence levels, home equity values, and personal debt burdens.

Gross vs Net Investment

Gross investment reflects total expenditure on capital equipment. Net investment equals gross investment minus capital depreciation.

Investment Determinants

Commercial interest rates, business confidence levels, corporate tax burdens, technological changes, and existing corporate debt burdens.

Accelerator Effect

Surging consumer demand forces firms near full capacity to invest heavily in capital machinery to expand long-term production.

Government Spending Determinants (G)

Fiscal policy mandates, political priorities, automatic welfare expenditures, and general business cycle conditions.

Net Export Determinants (X - M)

Foreign national income levels, domestic relative inflation, exchange rate shifts, and foreign trade barriers.

Demand-Side Shocks

Sudden shifts in aggregate demand caused by asset market collapses, credit crunches, consumer panic, or trading partner recessions.

Marginal Propensity to Consume (MPC)

The proportion of additional disposable income that households spend on domestic consumption rather than saving or paying tax. Used to determine the size of the Keynesian Multiplier.

The Multiplier Effect

Mechanism where an initial autonomous injection into the circular flow triggers a larger final surge in real national output.

Keynesian Multiplier Formula

Explains how an initial injection creates a magnified shift in aggregate demand. One person's spending becomes another person's income, triggering successive rounds of economic activity. A higher MPC leads to a larger multiplier, while higher withdrawals (savings, taxes, imports) reduce its overall value.

Multiplier and Spare Capacity

A tight economy lacking spare capacity converts spending injections into price inflation rather than real output gains.

Downward Multiplier Effect

Autonomous spending cuts or leakage surges trigger compounding drops in aggregate demand and employment.

Animal Spirits

Keynesian concept describing business confidence and financial mood, which drives private capital investment regardless of interest rates.

Investment Growth Limitations

Excessive capital investment fails to generate economic growth when wasted on administrative bureaucracy, misallocated projects, or delayed by lengthy implementation lags.

Short-Run Aggregate Supply (SRAS)

Aggregate supply is the total amount of goods and services that firms are willing and able to provide in an economy in a certain time period.

• Wage and state of technology are constant

• Higher prices mean higher supply, so it is upwards-slopingupward-sloping

SRAS Upward Slope Rationale

Fixed short-run wage contracts mean higher output prices expand profit margins, incentivizing firms to raise production volumes.

SRAS Shift Factors

Shifts stem from changes in wage rates, raw material costs, imported supply prices, business indirect taxes, or exchange rate swings.

Supply-Side Shocks

Unexpected supply-side disruptions like oil price spikes, extreme weather events, or major trade embargoes that shift SRAS inward.

Long-Run Aggregate Supply (LRAS)

The maximum level of real GDP that the economy is currently hypothetically able to achieve, with full employment in all sectors. It is impossible to produce more than this level given the economy's current technology and productivity (Yp).

Shifts in LRAS and Keynesian AS

• Changes in quantity and/or quality of factors of production

• Improvements in technology

• Increases in efficiency

• Changes in institutions

Monetarist/New Classical LRAS Model

Assumes long-run aggregate supply is vertical at full employment (Yp). Flexible wages ensure markets clear, rendering demand management inflationary in the long term.

Keynesian Aggregate Supply Curve

• At low economic output, there is plenty of spare capacity in the economy, and extra output can be ensured without any strain on price. 

• Once this spare capacity diminishes, there is pressure on scarce resources, increasing the general price level.

• At some point, everything will be fully employed, and it will be impossible to produce more output regardless of price level, similar to the LRAS. 

Keynesian LRAS Section 1 (Horizontal)

Substantial idle resources allow firms to raise production without increasing unit costs or output prices.

Keynesian LRAS Section 2 (Upward Sloping)

Approaching full employment creates factor shortages, driving up production costs and generating price inflation as output expands.

Keynesian LRAS Section 3 (Vertical)

Physical capacity limit reached. Supply becomes completely inelastic, converting spending surges into price inflation.

Monetarist Self-Correction Mechanism

Unemployment in a recession depresses wages, lowering production costs, shifting SRAS outward, and restoring full employment automatically.

Keynesian Persistent Deflationary Gap

Unions and employment contracts block wage reductions during recessions. Economies remain trapped in equilibrium below full employment without government demand stimulus.

Inflationary gap (neoclassical only)

Actual output exceeds potential output (Y > Yp). Factor overutilization triggers demand-pull inflation. Labor shortages occur as firms compete for workers, raising wages and adding to production costs.

Deflationary Gap (neoclassical only)

Actual output falls short of potential output (Y < Yp). This generates idle factory capacity and structural unemployment, so at least one factor of production is underemployed (inefficient).

Evaluating Economic Shocks

Shock severity hinges on duration, geographic scale, policy response capabilities, and local labor market flexibility.

Supply-Side Effect of Cheaper Imports

Lower foreign input prices reduce domestic production costs, shifting SRAS outward, expanding real output while lowering inflation.

Economic Growth Definition

An increase in real GDP or productive capacity over a specified time period.

Actual Growth vs Potential Growth

Short-term growth refers to actual growth in the economy, meaning a rightward shift in AD. Long-term growth refers to potential growth in the economy: In the long run, the economy could get to this point. 

Diagrammatic Representation of Growth

Short-run growth shifts AD rightward toward potential output. Long-run growth shifts LRAS or the PPC rightward and is determined by potential GDP (economic growth).

Benefits of Economic Growth

Raises average living standards, reduces absolute poverty, generates higher tax revenues, and stimulates private investment.

Costs of Economic Growth

Accelerates resource depletion, elevates industrial pollution, worsens income inequality, and risks severe demand-pull inflation.

Trade-off: Economic Growth vs Inflation

Rapid short-run aggregate demand expansion absorbs spare capacity, forcing up price levels unless matched by LRAS expansion.

Trade-off: Economic Growth vs Environmental Sustainability

Surging industrial production accelerates carbon emissions, exacerbates climate damage, and depletes natural resources.

Trade-off: Economic Growth vs Income Distribution

Unregulated market growth enriches skilled knowledge workers and capital owners while leaving low-skilled labor behind.

Trade-off: Economic Growth vs Current Account

Rising domestic real incomes prompt consumers to import expensive luxury goods, deepening current account trade deficits.

Trade-off: Economic Growth vs Unemployment

Automation and long-run efficiency gains expand productive potential while replacing workers, increasing structural unemployment.

Easterlin Paradox

Rising national income increases happiness at lower income levels, but beyond a critical threshold, further income gains yield minimal happiness gains.

National Wellbeing Measures

Composite metrics evaluating healthcare quality, environmental safety, education levels, and social cohesion alongside real GDP per capita.

National Wellbeing vs GDP per Capita

Standard GDP per capita ignores wealth concentration, mental health strains, and unpaid domestic labor, making composite wellbeing measures superior.

Recessions and Structural Trends

Two consecutive quarters of negative real GDP growth. Features surging bankruptcies, rising unemployment, falling investment, and deteriorating state budgets.

Unemployment Definition

Working-age individuals without work, available for work, and actively seeking employment within the past four weeks.

Unemployment Rate Formula

Unemployment Rate = (Number of Unemployed / Total Active Labor Force) * 100.

ILO Labor Force Survey

Standardized international survey tracking jobless individuals actively seeking work over four weeks and ready to start within two weeks.

Official Registration / Claimant Count

Government administrative tally measuring individuals officially claiming state unemployment benefits.

LFS vs Claimant Count Differences

Claimant counts understate unemployment by excluding job seekers ineligible for benefits, whereas the ILO survey captures non-claiming job seekers.

Frictional Unemployment

Unemployment occurs as people transition to a new job. There will be a few weeks or months when people are updating their resumes, applying for jobs, and attending interviews. 

Structural Unemployment

Long-term unemployment is caused by a mismatch of worker skills and employer demands, geographical immobility, or automation. Very much a supply-side issue.

Cyclical (Demand-Deficient) Unemployment

Unemployment as a result of a downturn in the business cycle (a lack of demand for work). It can be represented using a deflationary gap on an AD/AS curve.

Seasonal Unemployment

Predictable job losses occur in industries tied to specific seasonal cycles, like tourism or agriculture, which are basically solely dependent on periodic changes in demand.

Real-Wage Unemployment

Occurs when minimum wage laws or union bargaining force real wages above market-clearing equilibrium, creating labor surpluses.

Natural Rate of Unemployment (NRU)

Unemployment exists when the labor market reaches equilibrium at potential output (Yp). Calculated by adding Structural + Seasonal + Frictional all together. 

Costs of Unemployment to Workers & Society

Loss of disposable income, poverty, skill degradation, bad for family relationships, mental distress, indebtedness, widening social inequality, and elevated crime rates.

Costs of Unemployment to Government/Economy

Falling income tax revenues, lower indirect tax receipts, and surging expenditure on social welfare benefits. Lower GDP and more inequality.

Remedial Policies for Structural Unemployment

State-funded job retraining programs, relocation subsidies, vocational training grants, and labor market deregulation.

Inflation Definition

A sustained, generalized increase in the average price level across an economy over time.

Disinflation Definition

A deceleration in the rate of inflation while average price levels continue to rise.

Deflation Definition

Deflation is the sustained fall in the general price level in an economy over time.

Consumer Price Index (CPI)

Price index tracking changes in the cost of a representative consumer basket of goods and services over time. A base year. At the base year, the price index of goods and services are equal to 100.

CPI Inflation Rate Formula

The percentage change between the current CPI and the previous CPI.

Constructing the CPI Basket

Government agencies survey thousands of households to select common consumer goods, weighting each item by its expenditure share.

CPI Limitations

Excludes non-standard spending, has time lags, and doesn't capture informal market purchases. It averages households, neglects regional inflation variation, ignores product quality changes, and neglects evolving consumption patterns (maybe needs new basket construction).

Substitution Bias in CPI

CPI uses fixed basket weights, understating living standard adjustments when consumers swap expensive goods for cheaper substitutes.

Quality Bias in CPI

Price increases often reflect technological product upgrades rather than pure inflation, overstating true living cost spikes.

Producer Price Index (PPI)

Tracks price changes received by domestic producers for output, serving as an early indicator of consumer inflation.

Retail Price Index (RPI)

Alternative price index including housing costs and mortgage interest payments; usually yields higher figures than CPI.

Demand-Pull Inflation

• Inflation is caused by higher demand for goods and services in the economy, which grows faster than the supply. 

• It is considered "good" inflation because while the general price level rises, real GDP does so, too.

Cost-Push Inflation

Inflation is caused by higher production costs, which shift AS to the left. Considered the "bad" inflation, because prices rise and real GDP shrinks.

Wage-Price Spiral

Rising prices force workers to demand higher nominal wages, increasing firm production costs and driving prices higher.

Deflationary Spiral

Falling prices encourage consumers to delay spending, dropping aggregate demand, deepening recessions, and driving prices down further.

Supply-Side vs Demand-Side Deflation

Supply-side deflation stems from technological progress shifting LRAS rightward (beneficial deflation). Demand-side deflation stems from a collapse in AD (malignant deflation). add relevant formula/diagram

Costs of High Inflation

Erodes real purchasing power, penalizes savers when real interest rates turn negative, creates uncertainty, and degrades export competitiveness.