Unit 2.3 - Competitive Market Equilibrium

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A scenario where resources are distributed in a manner that no change in price would improve welfare for either consumers or producers.

allocative efficiency

Output

The total quantity of goods and services produced in an economy. It reflects the efficiency of resource allocation and is crucial for maximizing economic welfare and understanding market performance.

The additional satisfaction or value gained from consuming one more unit of a good, reflected in the maximum price a consumer is willing to pay.HL

Marginal benefit

State the formula: Area of a triangle (Area of a triangle)HL

Area of a triangle = 1/2 × base × height Used when the relevant consumer or producer surplus region is triangular on a demand-supply diagram; base is quantity, height is vertical price difference.

State the formula: Consumer surplusHL

Consumer surplus = Σ (marginal benefit_i − market price) for all units i purchased Unit-by-unit calculation summing the per-unit gains when marginal benefit exceeds the market price.

State the formula: Producer surplusHL

Producer surplus = Σ (market price − marginal cost_i) for all units i sold Unit-by-unit calculation summing the per-unit gains when market price exceeds marginal cost.

Equilibrium price and quantityHL

The price and quantity at which the quantity demanded equals the quantity supplied in a market. At this point, marginal benefit equals marginal cost, maximizing total surplus and achieving allocative efficiency.

The advantage received by firms when they sell a product at a price exceeding their minimum acceptable price.

Producer surplus

The difference between the market price and the minimum price at which producers are willing to supply.

PS

The difference between what consumers are willing to pay and the market price.

CS

State the formula: CS

CS = WTP - P Consumer surplus equals a buyer's willingness to pay minus the market price (WTP = willingness to pay; P = market price).

State the formula: PS

PS = P - WTS Producer surplus equals the market price minus a seller's willingness to supply (P = market price; WTS = willingness to supply).

Supernormal profit

Profit exceeding normal levels, calculated as the difference between market price and the minimum price producers are willing to accept. This indicates that firms are earning above their typical returns.

Willingness to pay (WTP)

The maximum price that a consumer is willing and able to pay for a good or service. It reflects the consumer's perceived value of the product and is used to calculate consumer surplus, which is the difference between WTP and the actual market price.

Willingness to supply (WTS)

The minimum price at which a producer is willing and able to supply a good or service. It indicates the lowest price at which a producer would be willing to sell, and is used to calculate producer surplus, which is the difference between market price and WTS.

A characteristic of the price mechanism that restricts or conserves resources as a result of increased prices.

rationing function

An aspect of the price mechanism that provides information to both producers and consumers, aiding in resource allocation.

signalling function

Anything that motivates individuals to take a specific action or alter their behavior.

Incentive

The benefit gained by buyers who can purchase a product for less than their maximum willingness to pay.

Consumer surplus

The process by which supply and demand shapes resource distribution in an economy.

price mechanism

auction

A method of allocating resources where the highest bidder secures the product. Auctions exemplify the rationing function of the price mechanism, determining who can purchase based on willingness to pay.

incentive function

The role of price changes in motivating producers and consumers to alter their behavior. Higher prices incentivize more production, while lower prices can lead to reduced supply, reflecting market dynamics.

The combined benefit that producers and consumers receive from participating in a market.

social surplus

State the formula: P (P)

P = MC Allocative efficiency condition: price equals marginal cost at the competitive market equilibrium.

State the formula: Social surplus

Social surplus = Consumer surplus + Producer surplus Identity expressing total welfare as the sum of consumer and producer gains from trade.

Excess demand (shortage)

A situation where the quantity demanded for a product exceeds the quantity supplied at a given price, leading to a shortage. This imbalance often results in upward pressure on prices as consumers compete for the limited goods available.

Excess supply (surplus)

A condition where the quantity supplied of a product exceeds the quantity demanded at a certain price, resulting in a surplus. This surplus typically leads to downward pressure on prices as suppliers seek to sell their excess inventory.

Marginal benefit (MB)

The additional benefit received from consuming one more unit of a good or service. It is crucial in determining allocative efficiency, as it must equal marginal cost for resources to be allocated optimally.

Social surplus (community surplus)

The sum of producer surplus and consumer surplus, indicating the total benefit to society from production and consumption. It is maximized at market equilibrium, where resources are allocated efficiently, meaning no one can be made better off without making someone else worse off.

A disequilibrium situation where the price is set above the equilibrium, creating a surplus.

excess supply

A situation where the quantity demanded does not equal the quantity supplied, leading to either shortages or surpluses.

Market disequilibrium

Created when the supply of a product exceeds its demand due to a higher price than equilibrium.

surplus

The condition where demand equals supply, eliminating surplus and shortage.

market equilibrium

The shortage that results when a price is held below the equilibrium level, so buyers want more than sellers will supply.

excess demand

The value at which a product trades when demand for it exactly matches supply, leaving neither shortage nor surplus in the market.

equilibrium price

State the formula: Equilibrium condition: D

Equilibrium condition: D = S The equilibrium price and quantity occur where quantity demanded equals quantity supplied.

State the formula: Excess demand (shortage): ED

Excess demand (shortage): ED = D(P) - S(P) At a given price below equilibrium, excess demand equals quantity demanded minus quantity supplied (example: ED($4) = 50 - 30 = 20).

State the formula: Excess supply (surplus): ES

Excess supply (surplus): ES = S(P) - D(P) At a given price above equilibrium, excess supply equals quantity supplied minus quantity demanded (example: ES($3) = 200 - 150 = 50).

disequilibrium

A market condition where the quantity demanded is either higher or lower than the quantity supplied, leading to inefficiencies such as shortages or surpluses. This occurs when the market price does not equal the equilibrium price, resulting in excess demand or excess supply.

equilibrium quantity

The quantity of a product where demand equals supply, establishing market balance. At this point, there is no excess demand or supply, which is crucial for understanding market efficiency and price stability.

non-price determinants

Factors other than price that influence demand or supply, such as consumer income, tastes, and the prices of related goods. Changes in these determinants lead to shifts in the demand or supply curves.

shift (of demand or supply)

A change in the demand or supply curve caused by non-price determinants, which affects the equilibrium price and quantity. This shift can result from factors like consumer preferences or production costs.

The price at which the quantity demanded matches the quantity supplied.

Market clearing price

The total value derived from both buyers and sellers at a specific market price and output level.

community surplus

Market-clearing price (equilibrium price)

The price at which the quantity demanded equals the quantity supplied, eliminating shortages or surpluses. This price maximizes community surplus, representing an efficient allocation of resources.