Understanding Market Equilibrium: Supply and Demand Dynamics

Perfect Competition

• Large number of companies: Many firms operate in the market.
• Homogeneous products: Companies produce identical standard products.
• Price takers: Individual producers are too small to influence the market price.

Demand

Demand is the quantity of a good or service that buyers are willing to purchase.

Demand Variables

The demand function is represented as: Qd = f(Px, R, Py, G), where variables include:

• Price of the good (Px)
• Consumer income (R)
• Price of related goods (Py)
• Consumer tastes and advertising (G)

The Demand Curve

The demand curve illustrates the relationship between price and quantity demanded, ceteris paribus.

Law of Demand

As the price increases, the quantity demanded decreases.

Distinctions in Demand

• Change in quantity demanded: A movement along the demand curve caused by a change in the price of the good.
• Change in demand: A shift of the entire demand curve caused by a change in a variable other than price.

Supply

Supply is the amount that companies are willing to sell of a given product.

Supply Variables

The supply function is represented as: Qs = f(P, Pf, T, Py, E), where variables include:

• Price of the product (P)
• Cost of production factors (Pf)
• Available technology (T)
• Prices of other goods (Py)
• Business expectations (E)

The Supply Curve

The supply curve shows the relationship between the price of goods and the amount offered, ceteris paribus.

Law of Supply

As the price increases, the quantity offered increases, ceteris paribus.

Distinctions in Supply

• Change in quantity supplied: A movement along the supply curve caused by a change in price.
• Supply variation: A shift of the entire supply curve caused by a change in any variable other than price.

Industry Supply

Industry supply is formed by aggregating the individual offerings of each vendor at every price point.

Market Equilibrium

A market is in equilibrium when the quantity consumers are willing to buy matches the quantity producers are willing to sell (Qd = Qs). This is the market clearing point where no excess supply or demand exists.

Equilibrium Price

The price at which the market clears is known as the equilibrium price.

Changes in Equilibrium

Equilibrium shifts when either the supply curve or the demand curve moves, resulting in new equilibrium price and quantity values.