United Grade 12 AP Macroeconomics
Chapters: 6
1. Basic Economic Concepts
Scarcity · Opportunity Cost and the Production Possibilities Curve (PPC) · Comparative Advantage and Gains from Trade · Demand · Supply · Market Equilibrium, Disequilibrium, and Changes in Equilibrium
- Introduction to Microeconomics and the Production Possibility Frontier – Microeconomics studies single units like one buyer or one firm; macroeconomics studies the whole economy. Resources are scarce and have other uses, so every economy must decide what, how and for whom to produce. The production possibility frontier (PPF) shows the best mixes of two goods an economy can make with all its resources used fully. Moving along it has an opportunity cost, which usually rises, so the PPF is concave.
- The Problem of Choice: Scarcity and Opportunity Cost – Our wants are unlimited but resources like money, time, land and workers are limited. This is scarcity, and it forces us to choose. The value of the next best option we give up is the opportunity cost. Economists study how people and societies make these choices. Every society must decide what, how and for whom to produce. Market, planned and mixed economies answer these differently, and a welfare state makes sure basic needs of all are met.
- Demand and Price Elasticity of Demand – Demand is the quantity of a good buyers are willing and able to buy at each price in a period. Market demand adds up all buyers' demand at each price. Demand depends on own price, income, prices of related goods, tastes, expectations and number of buyers. A change in own price moves us along the curve; a change in any other factor shifts it. Price elasticity of demand (Ed) = % change in quantity ÷ % change in price; it can also be judged from total expenditure.
- Producer's Equilibrium and Supply – A producer is in equilibrium when profit is the highest and there is no reason to change output. By the MR–MC approach two conditions must hold: MR = MC, and MC must be rising (MC cuts MR from below). Supply is the quantity firms are willing and able to sell at each price. Market supply adds all firms' supply. Supply depends on own price, input prices, technology, taxes, prices of other goods, number of firms and expectations. Own price moves us along the curve; other factors shift it. Es = % change in quantity supplied ÷ % change in price.
- Perfect Competition and Price Determination – In perfect competition, very many firms sell the same product to very many buyers, so each firm is a price taker. The market price is set where market demand equals market supply (Qd = Qs). If demand rises, price and quantity both rise; if supply rises, price falls and quantity rises.
2. Economic Indicators and the Business Cycle
The Circular Flow and GDP · Limitations of GDP · Unemployment · Price Indices and Inflation · Costs of Inflation · Real v. Nominal GDP · Business Cycles
- Circular Flow of Income and the Three Methods of Measuring National Income – In a two-sector economy households give factor services to firms and get factor payments (rent, wages, interest, profit); they spend this income on the firms' goods. Money moves in a circle opposite to the real flow of goods and services. Because the same money passes three points, national income can be measured three ways: value added by producers (product method), incomes paid to factors (income method) and spending on final goods (expenditure method). All three give the same total.
- Macroeconomic Indicators: GDP, Inflation and Unemployment – Governments judge how well an economy is doing with a few key numbers called macroeconomic indicators. The main ones are real GDP growth (is output rising?), inflation (are prices rising, and how fast?), unemployment (are people who want work able to find it?) and the current account balance (is the country paying its way with the rest of the world?). Each has a clear formula and each has limits.
- Index Numbers: Simple Aggregative Method, WPI, CPI, IIP, Uses and Inflation – An index number is a number that shows how much something (like prices or output) has changed compared with a base year, whose index is 100. The simple aggregative price index is ΣP1 ÷ ΣP0 × 100. Weighted indices give more importance to items bought more. India's key indices are the Consumer Price Index (CPI) for retail prices, the Wholesale Price Index (WPI) for wholesale prices and the Index of Industrial Production (IIP) for factory output. The inflation rate is the percentage rise in a price index over a year.
- National Income Aggregates: GDP, GNP, NDP, NNP, Real GDP and Welfare – Start with GDP at market price: value of all final goods and services made inside the country in a year. Subtract depreciation to go from Gross to Net. Add net factor income from abroad (NFIA) to go from Domestic to National. Subtract net indirect taxes (indirect taxes − subsidies) to go from Market Price to Factor Cost. NNP at factor cost is National Income. Nominal GDP uses current prices; real GDP uses base-year prices; GDP deflator = nominal ÷ real × 100. A higher GDP need not mean more welfare because of unequal distribution, non-monetary exchanges and externalities.
3. National Income and Price Determination
Aggregate Demand (AD) · Multipliers · Short-Run Aggregate Supply (SRAS) · Long-Run Aggregate Supply (LRAS) · Equilibrium in the Aggregate Demand- Aggregate Supply (AD-AS) Model · Changes in the AD-AS Model in the Short Run · Long-Run Self-Adjustment · Fiscal Policy · Automatic Stabilizers
- Aggregate Demand, Propensities to Consume and Save, and the Investment Multiplier – Aggregate demand (AD) is total planned spending on final goods: C + I + G + (X − M); in a two-sector model AD = C + I. Consumption depends on income: C = c̄ + bY, where b = MPC. APC = C/Y, MPC = ΔC/ΔY, APS = S/Y, MPS = ΔS/ΔY; APC + APS = 1 and MPC + MPS = 1. Short-run equilibrium output is where AD = AS (planned spending = output), or saving = planned investment. A rise in investment raises income by a multiple: k = ΔY/ΔI = 1/(1 − MPC) = 1/MPS.
- Aggregate Demand and Aggregate Supply: The AD-AS Model – The AD-AS model shows the whole economy on one graph: price level up, real GDP across. AD = C + I + G + (X − M) slopes down. SRAS slopes up because wages are sticky in the short run. LRAS is vertical at full-employment (potential) output. Where AD meets SRAS we get the short-run equilibrium. Shifts of AD or SRAS change prices and output and can open an inflationary or recessionary gap. In the long run wages adjust and the economy returns to LRAS; automatic stabilisers soften the swings.
- Government Budget and the Economy – A government budget is a yearly plan of expected receipts and planned expenditure. Receipts are revenue (taxes, non-tax income) or capital (borrowing, loan recovery, disinvestment). Spending is revenue (builds no asset) or capital (builds an asset or cuts debt). A budget can be balanced, surplus or deficit, and the deficit is measured as revenue, fiscal and primary deficit.
4. Financial Sector
Financial Assets · Nominal v. Real Interest Rates · Definition, Measurement, and Functions of Money · Banking and the Expansion of the Money Supply · The Money Market · Monetary Policy · The Loanable Funds Market
- Monetary Policy – Monetary policy is the use of interest rates and the money supply by a central bank to keep prices stable and support growth and jobs. Raising the policy rate makes borrowing dearer, cuts spending and aggregate demand, and lowers inflation (contractionary). Cutting it does the opposite (expansionary). Other tools include open market operations, quantitative easing, reserve requirements and forward guidance. Most central banks follow an inflation target and are independent of the government. Monetary policy works with time lags and is weaker when rates are already near zero.
- Money and Its Supply: Barter, Functions of Money and M1 – Barter (goods for goods) needs a double coincidence of wants and has no common measure of value. Money solves this. Its functions: medium of exchange (main), unit of account, store of value and standard of deferred payment. Money supply is the total stock of money held by the public (households and firms) at a point of time. Notes are issued by the RBI and coins by the government; demand deposits are created by commercial banks. Narrow money M1 = currency with the public (CU) + net demand deposits in banks (DD) + other deposits with the RBI (OD).
- Money Creation by Banks and the Central Bank (RBI) – Banks keep only a part of deposits as reserves (the legal reserve ratio, LRR) and lend the rest. Each loan is spent and comes back to banks as a new deposit, so total deposits become a multiple of the first deposit: total deposits = initial deposit × 1/LRR. The RBI is India's central bank: it issues currency, is banker to the government and to banks, is lender of last resort, controls credit and keeps foreign exchange reserves. It controls credit with repo rate, reverse repo rate, bank rate, CRR, SLR, open market operations and margin requirements.
5. Long-Run Consequences of Stabilization Policies
Fiscal and Monetary Policy Actions in the Short Run · The Phillips Curve · Money Growth and Inflation · Government Deficits and the National Debt · Crowding Out · Economic Growth · Public Policy and Economic Growth
- Fiscal Policy – Fiscal policy is how a government uses its spending (G) and taxes (T) to steer the whole economy. The budget compares the two: if spending is bigger than tax revenue the budget is in deficit and the government borrows; if tax is bigger, it is in surplus. In a slump the government can use expansionary policy (spend more or cut taxes) to raise total demand, output and jobs. When demand is too strong and inflation is high it can use contractionary policy (spend less or raise taxes). Because money is re-spent, a change in G has a bigger final effect on demand: the multiplier. Some changes happen by themselves (automatic stabilisers, such as falling tax receipts and rising benefits in a recession); others are chosen (discretionary). Fiscal policy has limits: time lags, rising public debt, higher interest rates (crowding out) and political pressure. It works alongside monetary policy, which is run by the central bank through interest rates.
- Government Budget and the Economy – A government budget is a yearly plan of expected receipts and planned expenditure. Receipts are revenue (taxes, non-tax income) or capital (borrowing, loan recovery, disinvestment). Spending is revenue (builds no asset) or capital (builds an asset or cuts debt). A budget can be balanced, surplus or deficit, and the deficit is measured as revenue, fiscal and primary deficit.
6. Open Economy: International Trade and Finance
Balance of Payments Accounts · Exchange Rates · The Foreign Exchange Market · Effect of Changes in Policies and Economic Conditions on the Foreign Exchange Market · Changes in the Foreign Exchange Market and Net Exports · Real Interest Rates and International Capital Flows
- Balance of Payments – The balance of payments (BoP) is a yearly record of all money dealings between residents of a country and the rest of the world. The current account records goods, services, transfers and income; the capital account records investment, loans and deposits. Autonomous items are done for their own sake; accommodating items (reserve changes) settle the gap. A BoP surplus raises reserves; a deficit lowers them.
- Foreign Exchange Rate – The foreign exchange rate is the price of one currency in terms of another, such as ₹80 per dollar. Under a flexible rate, demand for and supply of foreign currency set it; a rise means the rupee depreciates. Under a fixed rate, the government sets it and changes it by devaluation or revaluation. Managed floating mixes both: the market sets the rate, and the central bank smooths big swings.
- International Trade: Comparative Advantage, Protection and the Forex Market – Countries gain by specialising in goods where their opportunity cost is lowest (comparative advantage) and trading at terms between their costs. Tariffs, quotas and subsidies protect local firms but raise prices and cause a deadweight loss. Trade blocs and the WTO shape the rules. In the foreign exchange market, a rise in a country's real interest rate pulls in capital, raises demand for its currency, makes it appreciate and lowers net exports.