Price Mechanism and its Application Notes

Market Price Mechanism

Definition: The process whereby goods, services, or factors of production are exchanged in the market.
Functions of Prices:

  • Signalling: Prices provide information about the scarcity of goods.

  • Incentives: Prices motivate producers to allocate resources efficiently.

  • Rationing: Prices determine the distribution of scarce resources among competing uses.

Equilibrium Price and Quantity

Market Equilibrium: Occurs when quantity demanded equals quantity supplied.

  • Equilibrium Price (EP): The price at which the market clears.

  • Equilibrium Quantity (EQ): The quantity at which supply matches demand.
    Graphical Representation:

  • Demand Curve (DD): Represents consumer demand at various prices.

  • Supply Curve (SS): Represents producer supply at various prices.
    Equilibrium is achieved when DD intersects SS.

Demand and Supply Interaction

The interaction between demand and supply determines market prices:

  • Increases in Demand (e.g., during COVID-19 for face masks) lead to higher prices if supply does not keep up.

  • Increases in Supply (e.g., seasonal discounts) lead to lower prices when demand does not keep pace.

Law of Diminishing Marginal Utility

Definition: As more units of a good are consumed, the additional satisfaction (marginal utility) obtained from extra units decreases.
Impact on Demand:

  • Consumers are willing to pay less for subsequent units, leading to a downward-sloping demand curve.

Demand Curve Characteristics

Law of Demand: States that price and quantity demanded have an inverse relationship, ceteris paribus (other factors constant).
Graphical Representation:

  • Movement along Demand Curve: Indicates a change in quantity demanded due to a change in price.

Types of Demand

  • Individual Demand: Demand from a single consumer for a good or service.

  • Market Demand: Aggregate demand from all consumers in the market, derived from horizontal summation of individual demand curves.

Measuring Demand

Demand Schedule: A table showing the quantity demanded at various prices.
Demand Curve: A graphical representation that plots the quantity demanded against price.

Market Equilibrium Example (Lettuce)

  • Equilibrium Price: $2 per kg where quantity demanded (Qd) = quantity supplied (Qs) = 60 kg.

  • Surplus: Occurs when Qs > Qd, leading to a price decrease.

  • Shortage: Occurs when Qd > Qs, leading to a price increase.

Key Points

  • Equilibrium price remains unchanged only when there is no surplus or shortage in the market.

  • Changes in external factors can shift the demand or supply curves, affecting equilibrium price and quantity.