Economics Fundamentals, Demand & Supply

📊 At a Glance

Every JAIIB economics chapter — interest rate theory, RBI's monetary policy, fiscal policy, the Indian economy — leans on a handful of foundational ideas: how markets set prices, how elastic demand and supply are to price changes, and what "money" and "money supply" actually mean. This chapter builds those foundations.

1 Microeconomics vs Macroeconomics

Economics is the social science that studies how individuals, firms and governments make choices to allocate scarce resources among competing, unlimited wants. It is traditionally split into two branches:

2 Market, Command & Mixed Economies

Every economy must answer three basic questions — What to produce, How to produce, and For whom to produce. How an economy answers these determines its "economic system":

3 Law of Demand & the Demand Curve

Movement vs Shift of the Demand Curve

Key Determinants of Demand (besides own price)

• Income: For a normal good, demand rises with income; for an inferior good, demand falls as income rises (consumers switch to better substitutes).
• Price of related goods: A rise in the price of a substitute (e.g., tea) raises demand for the good (e.g., coffee); a rise in the price of a complement (e.g., sugar) lowers demand for the paired good (e.g., tea).
• Tastes & preferences, expectations of future price, number of buyers.

4 Law of Supply & the Supply Curve

Key Determinants of Supply (besides own price)

• Cost of production / input prices: Cheaper raw materials or labour raises supply (shifts curve right).
• Technology: Better technology lowers production cost, raising supply.
• Government policy: Taxes reduce supply (shift left); subsidies increase supply (shift right).
• Number of sellers, price of related goods (that use the same resources), expectations of future price.

5 Elasticity of Demand & Supply

Elasticity measures how responsive quantity demanded/supplied is to a change in price (or income, or the price of another good). It is calculated as:

Types of Elasticity of Demand

Degrees of (Price) Elasticity

Elasticity of Supply works the same way — measuring how responsive quantity supplied is to a price change. Goods that are easy to produce/store quickly (e.g., manufactured goods) tend to have elastic supply; goods with long production cycles or perishable/scarce inputs (e.g., fresh agricultural produce, land) tend to have inelastic supply.

6 Market Equilibrium

Market equilibrium is the point where the demand curve and supply curve intersect — the price at which quantity demanded exactly equals quantity supplied, with no tendency for price to change further.

• Excess Demand (Shortage): At a price below equilibrium, Qd > Qs. Buyers compete for the limited quantity, bidding price up toward equilibrium.
• Excess Supply (Surplus): At a price above equilibrium, Qs > Qd. Unsold stock piles up, forcing sellers to cut price down toward equilibrium.

7 Concept & Functions of Money

Money is anything generally accepted as a medium of exchange, a measure of value, and a store of value. It solves the core problem of barter — the "double coincidence of wants" (needing to find someone who wants exactly what you have, and has exactly what you want).

8 Money Supply — M1, M2, M3 & M4

Money supply is the total stock of money in circulation in the economy at a given point in time. RBI publishes four progressively broader measures, arranged in decreasing order of liquidity:

✓ Key Takeaways

• Microeconomics studies individual units (a consumer, a firm, a market); Macroeconomics studies the economy as a whole.
• India is a Mixed Economy — a private, price-driven market sector alongside government ownership and planning.
• Law of Demand: price and quantity demanded move inversely (downward-sloping demand curve).
• Law of Supply: price and quantity supplied move directly (upward-sloping supply curve).
• Elasticity measures how responsive quantity is to a price (or income, or cross-price) change — elastic (>1), unitary (=1), or inelastic (<1).
• Market equilibrium is where the demand and supply curves intersect — Qd = Qs.
• Money serves four functions: medium of exchange, measure of value, store of value, standard of deferred payment.
• Money Supply is measured by RBI as M1 (narrowest) through M4 (broadest); M3 ("Broad Money") is the most widely quoted.

📝 Top 50 JAIIB-Style MCQs on Economics Fundamentals

Test your understanding with these 50 practice MCQs, closely modelled on the JAIIB (IE & IFS) exam pattern. Each question has 5 options — the correct answer is hidden by default; tap "Show Answer" to reveal it along with a short explanation.