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Market Equilibrium

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Market Equilibrium

Imagine you are with a friend, and they are trying to sell you their iPhone for £800, but you can’t pay that amount. You ask them to bring the price down. After some negotiations, they bring the price down to £600. This is perfect for you, as that is the amount you were willing to buy an iPhone for. Your friend is also very happy because they managed to sell their iPhone at a sufficiently high price. You both made a transaction where market equilibrium occurred.

Market equilibrium is the point where the demand and supply for a good intersect. In other words, the point where they are equal. This article will teach you the ins and outs you need to know about market equilibrium.

Market equilibrium definition

A market is a place where buyers and sellers meet. When those buyers and sellers agree on what the price and quantity will be, and there’s no incentive to change the price or the quantity, the market is in equilibrium. In other words, market equilibrium is the point where the demand and supply are equal.

Market equilibrium is the point where the demand and supply are equal.

Market equilibrium is one of the main fundamentals of the free market. Prominent economists have argued that the market will always go towards equilibrium regardless of the circumstances. Whenever there’s an external shock that might cause disturbance in the equilibrium, it is a matter of time before the market regulates itself and goes to the new equilibrium point.

Market equilibrium is most efficient in markets close to perfect competition. When a monopoly power exerts control over the prices, it prevents the market from reaching the equilibrium point. That’s because companies with monopoly power often set prices above the market equilibrium price, thereby harming consumers and economic welfare.

Market equilibrium is a vital tool to assess how efficient a particular market is. Additionally, it provides useful insights to analyse whether the price is at an optimal level and whether the stakeholders are harmed by a price that’s above the equilibrium point.

In industries where firms can exert their market power to raise prices, this prevents some people who demand the product from attaining it as the price is unaffordable. However, firms in this situation can still increase their prices above equilibrium as, usually, they face little to no competition.

The graph of market equilibrium

The graph of market equilibrium provides useful insights into the dynamics of a market. Why do some economists argue that a market is destined to reach the equilibrium point in a free market setting?

To understand how and why the market reaches the equilibrium point consider Figure 1 below. Imagine that the free market equilibrium is at the intersection of supply and demand at the price of £4.

Imagine that transactions currently occur at a price of £3, which is £1 below the equilibrium price. At this point, you would have a firm willing to supply 300 units of goods, but consumers are willing to buy 500 units. In other words, there is excess demand for the good of 200 units.

The excess demand will push the price up to £4. At £4, firms are willing to sell 400 units, and buyers are ready to buy 400 units. Both sides are happy!

Market Equilibrium Price below market equilibrium StudySmarter Originals

Figure 1. Price below market equilibrium, StudySmarter Originals

Excess demand occurs when the price is below equilibrium and the consumers are willing to buy more than the firms are prepared to supply.

But what if the price at which transactions currently occur is £5? Figure 2 illustrates this scenario. In such a case, you would have the opposite. This time, you have buyers willing to buy only 300 units at £5, but sellers are willing to supply 500 units of goods at this price. In other words, there is an excess supply of 200 units on the market.

The excess supply will push the price down to £4. The equilibrium output occurs at 400 units where everyone is happy again.

Market Equilibrium Price above market equilibrium StudySmarter OriginalsFigure 2. Price above market equilibrium, StudySmarter Originals

Excess supply occurs when the price is above equilibrium and the firms are prepared to supply more than the consumers are willing to buy.

Due to the incentive provided by the dynamics of prices being above or below the equilibrium, the market will always have the tendency to move towards the equilibrium point. Figure 3 shows the market equilibrium graph. At the equilibrium point both the demand curve and the supply curve intersect, creating what is known as equilibrium price P and equilibrium quantity Q.

Market Equilibrium Market equilibrium graph StudySmarter OriginalsFigure 3. Market equilibrium graph, StudySmarter Originals

Changes in market equilibrium

One important thing to consider is that the equilibrium point is not static but subject to change. The equilibrium point can change when external factors cause a shift either in the supply or demand curve.

Market Equilibrium A change in market equilibrium as a result of a demand shift StudySmarter OriginalsFigure 4. A change in market equilibrium as a result of a demand shift, StudySmarter Originals

As Figure 4 shows, an outward shift in the demand curve would cause the market equilibrium to move from point 1 to point 2 at a higher price (P2) and quantity (Q2). The demand could shift either inwards or outwards. There are many reasons why the demand could shift:

  • A change in income. If an individual’s income increases, the demand for goods and services will also increase.
  • Taste change. If someone didn’t like sushi but started liking it, the demand for sushi would increase.
  • Price of substitute goods. Whenever there is an increase in a price of a substitute good, the demand for that good will fall.
  • Price of complementary goods. As these goods are significantly linked, a price drop in one of the complementary goods would increase the demand for the other good.

To learn more about the determinants of demand check our explanation on Demand.

Market Equilibrium A change in market equilibrium as a result of a shift in supply StudySmarter OriginalsFigure 5: A change in market equilibrium as a result of a shift in supply, StudySmarter Originals

In addition to demand shifts, you also have supply shifts that cause the market equilibrium to change. Figure 5 shows what happens to the equilibrium price and quantity when there’s a supply shift to the left. This would cause the equilibrium price to increase from P1 to P2, and the equilibrium quantity to decrease from Q1 to Q2. The market equilibrium will move from point 1 to point 2.

Many factors cause the supply curve to shift:

  • The number of sellers. If the number of sellers in the market increases, this would cause the supply to shift to the right, where you have lower prices and higher quantities.
  • Cost of input. If the cost of production inputs were to increase, it would cause the supply curve to shift leftwards. As a result, the equilibrium would occur at higher prices and lower quantities.
  • Technology. New technologies that would make the production process more efficient could increase supply, which would cause the equilibrium price to drop and the equilibrium quantity to increase.
  • The environment. Nature plays a vital role in many industries, especially agriculture. If there are no favourable weather conditions, the supply in agriculture would fall, causing an increase in equilibrium price and a decrease in equilibrium quantity.

To learn more about the determinants of supply check our explanation on Supply.

The market equilibrium formula and equations

If you are looking at how to estimate the market equilibrium demand and supply, the main formula to consider is Qs=Qd.

Assume that the demand function for the apple market is Qd=7-P, and the supply function is Qs= -2+2P.

How to estimate equilibrium price and quantity?

The first step is to calculate the equilibrium price by equalizing the quantity demanded and quantity supplied.

The price equilibrium, in this case, is P*=3 and the equilibrium quantity is Q*=4.

Keep in mind that the market equilibrium will always occur when the Qd=Qs.

A market is in equilibrium for as long as the planned supply and planned demand intersect. That is when they are equal to each other.

What would happen if there’s a change in the market equilibrium for some reason? That’s when disequilibrium occurs.

Disequilibrium occurs when the market cannot reach the equilibrium point due to external or internal factors that act upon the equilibrium.

When situations like this emerge, you would expect to see an imbalance between the quantity supplied, and the quantity demanded.

Consider the case of a fish market. Figure 6 below illustrates the market for fish that is initially in equilibrium. At point 1, the supply curve for fish intersects the demand curve, which provides the equilibrium price and quantity in the market.

Market Equilibrium Excess demand and excess supply StudySmarter OriginalsFigure 6. Excess demand and excess supply, StudySmarter Originals

What would happen if the price was P1 instead of Pe? In that case, you would have fishermen wishing to supply much more than the number of people who want to buy fish. This is a market disequilibrium known as excess supply: sellers wanting to sell more than the demand for the good.

On the other hand, you would have less fish supplied when the price is below the equilibrium price but significantly more fish demanded. This is a market disequilibrium known as excess demand. Excess demand happens when the demand for the good or service is much higher than the supply.

Many real-world examples point to disequilibrium in the market. One of the most common ones is the disruption in the supply chain process, especially in the US. The worldwide supply chain process has been tremendously impacted by Covid-19. As a result, many stores have had trouble having the raw materials shipped to the US. This, in turn, has contributed to an increase in prices and created a market disequilibrium.

Market Equilibrium - Key takeaways

  • When buyers and sellers come to the point of agreement on what the price and quantity of a good will be, and there’s no incentive to change the price or the quantity, the market is in equilibrium.
  • Market equilibrium is most efficient in markets close to perfect competition.
  • Due to the incentive provided by the dynamics of prices being above or below equilibrium, the market will always have the tendency to move towards the equilibrium point.
  • The equilibrium point can change when external factors cause a shift either in the supply or demand curve.
  • Reasons why the demand shifts include a change in income, price of substitute goods, change in taste, and the price of complementary goods.
  • Reasons why the supply shifts include the number of sellers, cost of input, technology, and the impact of nature.

Frequently Asked Questions about Market Equilibrium

When buyers and sellers come to the point of agreement on what the price and quantity will be, and there’s no incentive to change the price or the quantity, the market is in equilibrium.

The price for which the buyer and the seller agree.

The quantity agreed by the buyer and the seller.

Final Market Equilibrium Quiz

Question

What is a market?

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Answer

A market is a place where buyers and sellers meet.

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Question

What is market equilibrium?

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Answer

When buyers and sellers come to the point of agreement on what the price and quantity of a good will be, and there’s no incentive to change the price or the quantity, the market is in equilibrium.

Show question

Question

When is market equilibrium most efficient?

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Answer

In market close to perfect competition.

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Question

What's the impact of monopoly in market equilibrium?

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Answer

When a monopoly power exerts control over the prices, it prevents the market from reaching the equilibrium point. That’s because companies with monopoly power often set prices above the market equilibrium price, harming consumers and economic welfare.

Show question

Question

Can market equilibrium inform on how efficient a market is?

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Answer

Market equilibrium is a vital tool to assess how efficient a particular market is.

Show question

Question

Is market equilibrium static?

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Answer

No, it is subject to change.

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Question

What causes the market equilibrium to change?

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Answer

A shift in either supply or demand.

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Question

What are some factors that would shift the demand curve?

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Answer

A change in income 

The price of substitute goods 

A change in taste 

The price of complementary goods

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Question

What are some factors that would shift the supply curve?


Show answer

Answer

The number of sellers 

The cost of input 

Technology 

Nature

Show question

Question

Why does the market tend to reach the equilibrium point?

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Answer

Due to the incentive provided by the dynamics of prices being above or below the equilibrium, the market will always have the tendency to move towards the equilibrium point.

Show question

Question

How would an increase in income change the market equilibrium?

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Answer

Shifts the demand curve to the right where market equilibrium occurs at higher prices and higher quantity.

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Question

How would the market equilibrium change if there was an increase in cost of production?

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Answer

An increase in cost of production would shift the supply curve to the left, causing the market equilibrium to change in higher prices and lower quantity.

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Question

How would the market equilibrium change if many people decided that they don't like sushi anymore?

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Answer

This would cause the demand curve to shift to the left. The price for sushi would decrease and the quantity demanded as well.

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Question

How would the market equilibrium change as a result of a new technology?

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Answer

The new technology would help increase the supply for the good. Therefore, the supply curve would shift to the right and the new market equilibrium would occur at lower prices and higher quantity.

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