This chapter introduces the basics of macroeconomics and explains how it differs from microeconomics, highlighting its importance in understanding the economy as a whole.
Introduction – Formula & Equation Sheet
Essential formulas and equations from Introductory Macroeconomics, tailored for Class 12 in Economics.
This one-pager compiles key formulas and equations from the Introduction chapter of Introductory Macroeconomics. Ideal for exam prep, quick reference, and solving time-bound numerical problems accurately.
Key concepts & formulas
Essential formulas, key terms, and important concepts for quick reference and revision.
Formulas
Y = C + I + G + (X - M)
Y is the national income (GDP), C is consumption, I is investment, G is government spending, X is exports, and M is imports. This formula represents the aggregate demand in an economy.
C = a + bY
C is consumption, Y is income, a is autonomous consumption (consumption when income is zero), and b is the marginal propensity to consume. It shows how consumption changes with income.
S = Y - C
S represents savings, Y is income, and C is consumption. This formula helps in determining the total savings in an economy.
MPC = ΔC / ΔY
MPC is the marginal propensity to consume, ΔC is the change in consumption, and ΔY is the change in income. It indicates how much consumption changes with income changes.
MPS = ΔS / ΔY
MPS is the marginal propensity to save, ΔS is the change in savings, and ΔY is the change in income. It represents the fraction of any additional income that is saved.
GDP Deflator = (Nominal GDP / Real GDP) × 100
The GDP deflator measures the level of prices of all new, domestically produced, final goods and services in an economy. It shows the true value of the GDP in terms of price adjustments.
Unemployment Rate = (Unemployed / Labor Force) × 100
The unemployment rate is the percentage of the labor force that is unemployed. It helps evaluate the economic health of a country.
Inflation Rate = [(CPI this year - CPI last year) / CPI last year] × 100
CPI is the Consumer Price Index. The inflation rate measures the average change over time in the prices paid by urban consumers for a market basket of consumer goods and services.
Interest Rate = (Interest / Principal) × 100
The interest rate is the cost of borrowing or the return for investing. It is expressed as a percentage of the principal amount.
Investment = Savings + Government Spending + (Exports - Imports)
This formula illustrates the funding for investments in an economy based on savings, government spending, and trade balance.
Equations
Aggregate Demand (AD) = C + I + G + (X - M)
AD represents the total demand for final goods and services in an economy at a given time. This equation summarizes the components of aggregate demand.
Labour Force Participation Rate = (Labour Force / Working Age Population) × 100
This rate indicates the proportion of the working-age population that engages in the labor market.
Okun's Law: % Change in GDP = 3 - 2 × (Change in Unemployment Rate)
This empirical relationship highlights the inverse relationship between unemployment and GDP growth.
Balance of Trade = Exports - Imports
This equation represents the difference between a country's exports and imports, indicating a trade surplus or deficit.
Money Supply (M) = Currency + Demand Deposits
This equation defines the total amount of monetary assets in an economy that are available for spending.
Velocity of Money (V) = (P × Y) / M
Here, V is the velocity of money, P is the price level, Y is real output, and M is the money supply. It measures how quickly money circulates in the economy.
Phillips Curve: Unemployment Rate = Natural Rate - b (Inflation Rate)
This relationship suggests an inverse relationship between the rate of unemployment and the rate of inflation within an economy.
National Debt = Total Government Borrowing - Government Surplus
This equation provides insight into the total amount of money that a government owes to creditors.
Tax Revenue = Tax Rate × Tax Base
This equation defines the income generated from taxation, helping governments estimate their revenue.
Fiscal Policy = Government Spending + Taxation
This principle outlines the government's use of spending and taxation to influence the economy.
This chapter explores the principles of National Income Accounting and its significance in understanding economic performance. It highlights methods for measuring national income, including their implications.
Start chapterThis chapter explains the role, functions, and importance of money and banking in the economy.
Start chapterThis chapter explores how income and employment levels are determined in an economy, highlighting the role of aggregate demand and its components.
Start chapterThis chapter explains the role of government budgets in a mixed economy, focusing on revenue sources, expenditure functions, and their significance in economic stability.
Start chapterThis chapter explores open economy macroeconomics, highlighting the interactions between a country's economy and the global market. Understanding these interactions is crucial for comprehending total national output and factors influencing it.
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