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Market Equilibrium and Adjustment
Equilibrium and Market Dynamics
Define market equilibrium and explain how prices adjust to eliminate surpluses and shortages.
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- Mankiw — Chapter 4, The market forces of supply and demand.pdfPDF · 38 pg · Ready
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A price ceiling below equilibrium holds the price where buyers want more than sellers are willing to supply. At the coffee market's equilibrium of $4, 400 cups are bought and sold; a ceiling at $3 raises quantity demanded to 500 cups while quantity supplied falls to 300, leaving a shortage of 200 cups .
Normally that gap would push the price up until the two quantities meet again, but the ceiling makes the increase illegal, so the shortage persists. The market rations the 300 cups some other way instead: queues, first-come-first-served, or sellers choosing whom to serve . That is why binding ceilings, like rent control, tend to produce waiting lists rather than lower bills for everyone .
SourcesMankiw — Chapter 4 · p. 78Lecture 6: Supply, demand and equilibrium · 24:15
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1. Foundations of Market Behavior
- The Demand Side
- The Supply Side
- Exam: Foundations of Market Behavior
2. Market Equilibrium and Adjustment
- Equilibrium and Market Dynamics
- Exam: Market Equilibrium and Adjustment
3. Elasticity and Revenue
- Measuring Responsiveness
- Exam: Elasticity and Revenue
Principles of Supply and Demand
Review the syllabus: you can rename, remove, or reorder before starting.
- 1Foundations of Market Behavior
Understand how individual decisions by buyers and sellers form the basis of market interactions.
- The Demand Side
- The Supply Side
Exam: Foundations of Market Behavior
- 2Market Equilibrium and Adjustment
Analyze how prices coordinate the decisions of buyers and sellers to achieve market balance.
- Equilibrium and Market Dynamics
Exam: Market Equilibrium and Adjustment
- 3Elasticity and Revenue
Evaluate how consumers and firms respond to price changes.
- Measuring Responsiveness
Exam: Elasticity and Revenue
Start course
Market Equilibrium and Adjustment
Equilibrium and Market Dynamics
Define market equilibrium and explain how prices adjust to eliminate surpluses and shortages.
Building the outline0 of 6
Define Market Equilibrium
Market equilibrium is identified by placing both the supply and demand curves on the same graph, where their point of intersection marks the equilibrium. At this specific point, the equilibrium price is reached where the quantity demanded by buyers is exactly equal to the quantity supplied by sellers. Consequently, the equilibrium quantity represents the total amount of the good that is bought and sold at that price, effectively balancing the intentions of both buyers and sellers.
Exercise
Consider a competitive coffee market where the equilibrium price is $4. If the market price is currently set at $5, and then falls to $3, how does the market respond to reach equilibrium?
- At $5, there is a shortage; at $3, there is a surplus. Prices adjust until they reach $4.
- At $5, there is a surplus; at $3, there is a shortage. Cafés cut prices during a surplus and raise prices during a shortage until they reach $4.
- At $5, there is a surplus; at $3, there is a shortage. Cafés raise prices during a surplus and cut prices during a shortage until they reach $4.
- At $5, buyers want more than sellers offer; at $3, sellers offer more than buyers want. The market remains at these prices.
Check
Exogenous shifts can change the equilibrium state of a market. When demand shifts to the right, such as during a hot new coffee trend, both the equilibrium price and quantity increase. Conversely, if supply shifts to the left, as seen when a frost destroys part of a bean harvest, the price rises while the quantity decreases.
Market Adjustment and Equilibrium Shifts
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In the coffee market, what happens at a price of $5 when equilibrium is $4?
Quantity supplied (500 cups) exceeds quantity demanded (300): a surplus of 200 cups, and the price is pushed down toward $4.
Mankiw — Chapter 4 · p. 78What does the law of demand say?
Other things equal, when the price of a good rises, the quantity demanded falls.
Mankiw — Chapter 4 · p. 72Again<1 minHard10 minGood3 daysEasy12 days
3 / 12
~4 min · Space reveals · 1–4 grades · E edit · S postpone
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Question 3 of 5
The coffee market is in equilibrium at $4 and 400 cups. If the price is set at $5, what happens?
- A shortage of 200 cups appears
- A surplus of 200 cups appears and the price is pushed down
- The demand curve shifts to the right
- Nothing changes: quantity supplied and demanded stay equal
At $5 sellers offer 500 cups but buyers only want 300. The unsold 200 cups are a surplus, and sellers cut the price until the market is back at $4 and 400 cups.
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