Topic 5: Market Equilibrium

Farmer’s Market

• Organic vegetables and fruits that are grown and sold within a specific geographical region should, in theory, cost less than conventional produce due to lower transportation costs.

• This is often not the case in practice.

• Credit: modification of "Old Farmers' Market" by NatalieMaynor/Flickr, CC BY 2.0.

Chapter Objectives

• Key concepts to learn in this chapter:

  • Demand, Supply, and Equilibrium in Markets for Goods and Services

  • Shifts in Demand and Supply for Goods and Services

  • Changes in Equilibrium Price and Quantity: The Four-Step Process

  • Price Ceilings and Price Floors

Introduction to Demand and Supply

Why Can We Not Get Enough of Organic Foods?

• Organic food is gaining popularity globally, becoming mainstream and widely available.

• The price disparity between organic and conventional foods raises questions:

  • Example: Organic Fuji apple costs $2.75/pound, conventional $1.72/pound.

  • If many organic foods are locally grown, why are they not cheaper?

• This price situation can be understood through the concepts of demand and supply.

Auction Example

• Example: Auction prices for unique items (e.g., Whitney Houston's dress) illustrate how perceived rarity can influence demand and price.

• Consumers react differently to prices based on their perception of value and desirability.

  • Link it up: Learn more about bizarre celebrity item purchases (website provided in original text).

Price of Gasoline Example

• In June 2020, average gasoline price was $3.16 per gallon; it fell to $2.42 per gallon by January 2021.

• Price changes can be influenced by various factors affecting demand and supply, such as:

  • Seasonal changes (higher demand in summer), increases in supply, and changes in crude oil demand.

Demand, Supply, and Equilibrium in Markets for Goods and Services

Learning Objectives

• Understand and explain:

  • Demand, quantity demanded, and the law of demand.

  • Supply, quantity supplied, and the law of supply.

  • Identify demand and supply curves.

  • Explain equilibrium, equilibrium price, and equilibrium quantity.

Demand for Goods and Services

• Demand: The amount of a good or service consumers are willing and able to purchase at each price.

• Fundamental concepts:

  • Based on needs and wants.

  • It also considers ability to pay (effective demand).

• Price: Amount paid for a unit of good/service.

• Quantity Demanded: Total units purchased at a specific price.

• Law of Demand: As price rises, quantity demanded generally decreases; conversely, as price falls, quantity demanded increases.

  • Example: Increase in gasoline price leads consumers to reduce consumption.

• Demand schedules illustrate the relationship between price and quantity demanded.

• Demand Curve: Graphical representation with price on the vertical axis and quantity on the horizontal axis, typically downward sloping.

  • Reflects the law of demand: higher prices decreasing quantity demanded.

• Demand vs. Quantity Demanded:

  • Demand refers to the overall relationship (the curve), while quantity demanded is a specific point on this curve.

Supply of Goods and Services

• Supply: The amount that a producer is willing to sell at each price.

• Price: Amount received from selling one unit; higher prices generally lead to greater quantity supplied due to profit motivation.

• Law of Supply: Higher prices lead to an increase in quantity supplied and lower prices lead to a decrease in quantity supplied.

• Similar to demand, supply can be depicted as a schedule or a curve.

  • Supply curves usually slope upward from left to right, showing the relationship between price and quantity supplied.

  • Supply vs. Quantity Supplied: Supply represents the overall relationship (the curve), while quantity supplied refers to a specific point.

Equilibrium — Where Demand and Supply Intersect

• Graphically, both demand and supply curves can be combined; where they intersect is the equilibrium point (E).

• Equilibrium Price: The price at which quantity demanded equals quantity supplied.

• Equilibrium Quantity: Corresponding quantity at the equilibrium price.

• Effects of non-equilibrium prices:

  • Above equilibrium price leads to excess supply (surplus).

  • Below equilibrium price leads to excess demand (shortage).

• If the market is not at equilibrium, economic pressures will push it toward this point.

Shifts in Demand and Supply

3.2 Learning Objectives

• Identify and graph shifts in demand and supply.

Factors Affecting Demand

• Willingness to purchase based on tastes/preferences, income levels, prices of related goods (substitutes/complements), and population size.

• Ceteris Paribus Assumption: Holding other variables constant while examining changes in price.

• Real-world scenario applications, such as how health concerns can shift demand for specific foods like vegetarian options.

Shifts in Demand: Income Example

• As income increases, consumers may demand more products, illustrated by a rightward shift in the demand curve.

• Conversely, a decrease in income results in a leftward shift, indicating lower demand at all price levels.

Other Factors that Shift Demand

• Changing tastes, shifts in population demographics, relative prices of substitutes/complements, and consumer expectations.

• Demand shifts can significantly alter market equilibrium, necessitating an adjusted analysis using the four-step process.

Shifts in Supply Components

• Input costs, natural conditions, technology changes, and government policies significantly impact supply shifts in response to changes in production costs.

Equilibrium Changes and the Four-Step Process

Changes in Equilibrium Price and Quantity: Steps

• Step 1: Draw initial supply and demand curves.

• Step 2: Determine if the change affects demand or supply.

• Step 3: Assess if the effect causes a shift to the right or left.

• Step 4: Identify new equilibrium and compare with original equilibrium.

• Practical examples provided for clarity, such as effects of economic changes on markets and equilibrium effects due to new technologies or external events.

Price Ceilings and Floors

Learning Objectives

• Understand price controls, ceilings, and floors in markets, along with their implications.

Price Ceilings

• Laws set to prevent prices from rising above a specific level; often intended to keep essential goods affordable.

• Examples include rent controls in major cities.

• Price ceilings lead to shortages as demand often exceeds supply.

• Historical context relating to social pressures and economic outcomes from price controls.

Price Floors

• Laws preventing prices from falling below certain levels; minimum wage laws serve as a prominent example.

• Price floors can create surpluses by causing excess supply.

• Economic trade-offs and welfare implications of price floor regulations are discussed, including potential adverse effects on employment.

Demand, Supply, and Efficiency

Key Concepts

• Distinction between consumer surplus, producer surplus, and social surplus is highlighted.

• Economic efficiency relates to maximizing overall societal benefit from resource allocation.

• Discussion on how price controls lead to inefficiencies, illustrated by examples and graphical models, emphasizing the relation between demand/supply shifts and social surplus outcomes.

Conclusion Strategy

• Emphasizes the versatile nature of demand and supply models in analyzing various economic scenarios, including labor and financial markets.

• The overarching conclusion that price controls distort the informative nature of market functions underlines the value of allowing prices to adjust freely.

Key Terms

• Ceteris Paribus: Other things being equal.

• Demand: Demand at various price levels for goods/services.

• Equilibrium: Price and quantity matching the intersection of demand/supply curves.

Self-Check Questions

Demand and Supply Questions

• Various questions exploring hyper-specific scenarios exemplifying how shifts and price controls impact market dynamics across goods and services.