- Understand the concept of market equilibrium.
- Analyze the conditions for excess demand and excess supply in a market.
- Explain the impact of shifts in demand and supply on equilibrium price and quantity.
- Describe the characteristics of perfectly competitive markets and how they affect equilibrium.
- Evaluate the effects of government-imposed price ceilings and floors on market equilibrium.
- Discuss the relationship between consumer income changes and demand for normal and inferior goods.
- Assess the implications of free entry and exit of firms in a market on equilibrium outcomes.
Market Equilibrium
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Revision Notes & Summary
TopChapter 5: Market Equilibrium
5.1 Equilibrium, Excess Demand, Excess Supply
- Equilibrium: A situation where the plans of all consumers and firms in the market match, leading to market clearing.
- *Equilibrium Price (p)**: The price at which market supply equals market demand.
- *Equilibrium Quantity (q)**: The quantity bought and sold at the equilibrium price.
Key Concepts
- Excess Demand: Occurs when market demand exceeds market supply at a given price.
- Excess Supply: Occurs when market supply exceeds market demand at a given price.
Graphical Representation
- Equilibrium is represented graphically at the intersection of the market demand curve (DD) and market supply curve (SS).
5.1.1 Market Equilibrium: Fixed Number of Firms
- In a perfectly competitive market with a fixed number of firms:
- Demand Curve (DD): Represents how much consumers are willing to purchase at different prices.
- Supply Curve (SS): Represents how much firms are willing to supply at different prices.
- Equilibrium Point: Intersection of DD and SS curves.
Effects of Shifts in Demand and Supply
- If the supply curve shifts rightward (demand unchanged):
- Equilibrium quantity increases, equilibrium price decreases.
- If both curves shift in the same direction:
- Effect on equilibrium quantity can be determined; effect on price depends on the magnitude of shifts.
- If curves shift in opposite directions:
- Price effect can be determined; quantity effect depends on the magnitude of shifts.
5.1.2 Market Equilibrium: Free Entry and Exit
- In a market with free entry and exit:
- Equilibrium price equals minimum average cost of firms.
- No firm earns supernormal profit or incurs losses.
Table 5.1: Impact of Simultaneous Shifts on Equilibrium
| Shift in Demand | Shift in Supply | Quantity Change | Price Change |
|---|---|---|---|
| Leftward | Leftward | Decreases | May vary |
| Rightward | Rightward | Increases | May vary |
| Leftward | Rightward | May vary | Decreases |
| Rightward | Leftward | May vary | Increases |
Important Definitions
- Income Effect: Change in optimal quantity due to change in purchasing power from price change.
- Indifference Curve: Locus of points where the consumer is indifferent among bundles.
- Inferior Good: Demand decreases as consumer income increases.
- Normal Good: Demand increases as consumer income increases.
- Price Ceiling: Government-imposed upper limit on price.
- Price Floor: Government-imposed lower limit on price.
Conclusion
- Understanding market equilibrium is crucial for analyzing how prices and quantities are determined in competitive markets.
Practice Test – MCQs, True/False
TopMultiple Choice Questions
A.
Equilibrium price increases
B.
Equilibrium price decreases
C.
Equilibrium price remains unchanged
D.
Equilibrium price fluctuates
Correct Answer: C
Solution:
With free entry and exit, the equilibrium price remains equal to the minimum average cost, so it remains unchanged despite a rightward shift in demand.
Chapter Concept:
Demand and Supply Shifts
A.
Excess supply
B.
Excess demand
C.
No change in market conditions
D.
Market equilibrium remains unchanged
Correct Answer: B
Solution:
A price ceiling set below the equilibrium price results in excess demand because the quantity demanded exceeds the quantity supplied at the ceiling price.
Chapter Concept:
Market Equilibrium
A.
The point where market demand equals market supply.
B.
The point where market demand exceeds market supply.
C.
The point where market supply exceeds market demand.
D.
The point where prices are fixed by the government.
Correct Answer: A
Solution:
Market equilibrium is defined as the point where the market demand equals market supply, determining the equilibrium price and quantity.
Chapter Concept:
Market Equilibrium
A.
By equating the wage rate to the marginal revenue product of labor (MRPL).
B.
By equating the wage rate to the average cost of labor.
C.
By maximizing the total revenue irrespective of labor cost.
D.
By minimizing the marginal cost of labor.
Correct Answer: A
Solution:
In a perfectly competitive market, a firm employs labor up to the point where the wage rate equals the marginal revenue product of labor (MRPL), which is the product of marginal revenue and marginal product of labor.
Chapter Concept:
Marginal Revenue Product of Labour
A.
Equilibrium price is higher than the minimum average cost
B.
Equilibrium price is lower than the minimum average cost
C.
Equilibrium price equals the minimum average cost
D.
Equilibrium price is unaffected by entry and exit
Correct Answer: C
Solution:
In a perfectly competitive market with free entry and exit, the equilibrium price is equal to the minimum average cost, ensuring firms earn normal profit.
Chapter Concept:
Market Equilibrium
A.
It sets the price of goods directly.
B.
It raises prices in case of excess supply.
C.
It adjusts prices to eliminate excess demand or supply.
D.
It prevents any price changes.
Correct Answer: C
Solution:
The 'Invisible Hand' refers to the self-regulating nature of the market that adjusts prices to eliminate excess demand or supply, moving towards equilibrium.
Chapter Concept:
Excess Demand and Supply
A.
Equilibrium price will be above the minimum average cost
B.
Equilibrium price will be below the minimum average cost
C.
Equilibrium price will equal the minimum average cost
D.
Equilibrium price will fluctuate unpredictably
Correct Answer: C
Solution:
In a market with free entry and exit, firms will enter or exit until the equilibrium price equals the minimum average cost, ensuring only normal profits.
Chapter Concept:
Excess Demand and Supply
A.
It shifts the supply curve to the left
B.
It shifts the supply curve to the right
C.
It causes a movement along the supply curve
D.
It has no effect on the supply curve
Correct Answer: C
Solution:
An increase in the wage rate causes a movement along the supply curve as individuals decide to supply more or less labour based on the trade-off between income and leisure.
Chapter Concept:
Wage Determination in Labour Market
A.
MRPL is equal to the wage rate.
B.
MRPL is greater than the wage rate.
C.
MRPL is less than the wage rate.
D.
MRPL has no relation to the wage rate.
Correct Answer: A
Solution:
In equilibrium, a firm will employ labor up to the point where the marginal revenue product of labor (MRPL) is equal to the wage rate, ensuring maximum profit.
Chapter Concept:
Marginal Revenue Product of Labour
A.
Auctioning
B.
Rationing
C.
Increasing production
D.
Subsidizing producers
Correct Answer: B
Solution:
The government may use rationing to distribute the limited supply of goods under a price ceiling, ensuring that each consumer receives a fair share.
Chapter Concept:
Price Ceiling and Price Floor
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Market Equilibrium
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Locked • Full Phase AssessmentStep 3: Redemption Arena
Locked • AI Weakness TrackerTrue or False
Correct Answer: False
Solution:
A price ceiling set below the equilibrium price leads to excess demand, not excess supply, as the lower price increases quantity demanded while reducing quantity supplied.
Chapter Concept :
Price Ceiling and Price Floor
Correct Answer: True
Solution:
In a perfectly competitive labour market, the wage rate is determined where the demand for labour equals the supply of labour.
Chapter Concept :
Wage Determination in Labour Market
Correct Answer: False
Solution:
Simultaneous shifts in demand and supply curves can lead to ambiguous effects on equilibrium price and quantity, depending on the relative magnitudes and directions of the shifts.
Chapter Concept :
Simultaneous Shifts in Demand and Supply
Correct Answer: True
Solution:
The marginal revenue product of labour is indeed calculated by multiplying the marginal product of labour by the marginal revenue.
Chapter Concept :
Marginal Revenue Product of Labour
Correct Answer: True
Solution:
The marginal revenue product of labour is indeed calculated by multiplying the marginal product of labour with the marginal revenue, as it represents the additional revenue generated by employing one more unit of labour.
Chapter Concept :
Marginal Revenue Product of Labour
Correct Answer: True
Solution:
When the demand curve shifts to the right, it indicates an increase in demand at each price level. This results in a new equilibrium where both the price and quantity are higher than before, as shown in the demand-supply analysis.
Chapter Concept :
Demand and Supply Shifts
Correct Answer: False
Solution:
In markets with free entry and exit, shifts in demand affect the equilibrium quantity and the number of firms, but not the equilibrium price, which remains equal to the minimum average cost.
Chapter Concept :
Free Entry and Exit in Markets
Correct Answer: False
Solution:
In a perfectly competitive market, excess demand leads to upward pressure on prices as consumers are willing to pay more to obtain the limited supply.
Chapter Concept :
Excess Demand and Supply
Correct Answer: True
Solution:
In a perfectly competitive labour market, the wage rate is determined at the intersection of the demand and supply curves of labour, where the demand for and supply of labour balance.
Chapter Concept :
Wage Determination in Labour Market
Correct Answer: True
Solution:
With free entry and exit, firms earn normal profits in the long run, leading to the equilibrium price equaling the minimum average cost.
Chapter Concept :
Free Entry and Exit in Markets
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