Movement Along the Demand Curve and Shift of the Demand Curve

The Demand Curve and Shift of the Demand Curve

The economy continually keeps changing, and so does the Demand in the current market. Every business and even the industries keep a record of how this Demand changes. The factors affecting it cause fluctuations in the market. For better analysis and understanding, usually, a Demand Curve is created. However, what is a Demand Curve, and how does it help? Is there any difference between the movement and Shift along the Demand Curve? Let us have a better insight into what it exactly is.

What is the Demand Curve?

It is defined as the graphical representation between the Demand and price of commodities and how the graph transforms with a change in their values. The Demand Curve comes as a result of the law of Demand and the law of supply. 

According to the law of Demand, with increases in prices, the Demand decreases. If put in mathematical terms, Demand is an inverse of prices. 

According to the law of supply, with an increase in prices, the quantity supply also increases. 

Both these laws help in understanding the interaction of market prices with the Demand for goods and their supply. It is not just the price and quantity that affect the Demand Curve but there are also several other impactful factors. 

Movement and Shift along the Demand Curve

For all the supplies that a company provides, there are changes in the Demand Curves; but based on what factors does this happen? You can expect the changes in the Demand Curve based on the following two factors.

  • A change in the Demand for goods.

  • A change in the number of goods.

This leads to the movement and Shift along the Demand Curve. What is the difference between the two? How does it affect the Curve?

Movement in the Demand Curve

Are you wondering what causes a movement along the Demand Curve?

Movement along the Demand Curve happens because of the change in the price of commodities. This further affects the quantity Demanded. All other factors remain unchanged. Under such a scenario, the graph moves along the Y-axis, as the price is plotted against it. At the same time, the other axis remains constant. 

So, in such a scenario, with an increase in price, the Demand decreases, and with a decrease in price, the Demand increases.

The movement happens in a contraction and expansion format. Consider the following example.

Contraction of the Curve: For instance, if the price increases from 10to12 for a commodity, then the supply decreases from 100 to 80. This is called a contraction of the Demand Curve. 

Expansion of the Curve: For instance, if the price decreases from 10to8 for a commodity, then the supply increases from 100 to 120. This is called an expansion of the Demand Curve.

There is no Shift in the position of the Curve, just an increase or decrease in the slope.

Then, what causes a Shift in the Demand Curve?

Shift in the Demand Curve

This happens when there is a change in any other factor apart from the price. It could be due to the quantity, consumer income, or several other factors on which the Demand Curve is based. Under this, even the price can vary. This leads to left or right Shift in the Demand Curve. 

The factors leading to a Shift in the Curve are as follows.

  • Increase in Demand quantity of the products due to popularity

  • Increase in the price of a competitive good

  • A rise in the income of consumers

  • Seasonal factors 

It leads to a Shift in the Demand Curve, depending on the factors. 

A movement and Shift can also occur in the same Curve over a longer time period. Initially, an increase in price for a certain commodity could lead to a movement in the Curve. However, with time, it could lead to a Shift in the same Curve, depending on other factors.


In economics, Demand refers to a customer's willingness and capacity to buy a product or service. It is the driving force behind economic progress and growth. No company would bother to produce anything if there was no Demand.

The link between quantity required and price is governed by the law of Demand. This economic principle explains something you probably already know intuitively. When prices rise, people buy less. It's also true the other way around. People buy more when the price falls.

Demand Curve 

The Demand Curve is an economics line graph that depicts how many units of an item or service will be purchased at different pricing. On the vertical (Y) axis, the price is represented, while the quantity is plotted on the horizontal (X) axis.

Demand Curves are used to determine the relationship between price and quantity, and they are based on the law of Demand, which asserts that as the price rises, the amount desired decreases. Furthermore, Demand Curves are frequently paired with supply Curves to estimate the market's equilibrium price and quantity.

Movement in Demand Curve

The movement of the quantity Demanded along the same Curve occurs when the quantity wanted of a given commodity changes due to a change in price while all other parameters stay constant.

The crucial thing to remember is that other elements such as the consumer's income and preferences, as well as the pricing of other commodities, remain constant, whereas only the price of the commodity fluctuates.

The change in price influences the quantity Demanded in this case, but the Demand Curve remains the same as before the price changes. The Demand Curve is moving. Along the Demand Curve, the movement might be either upward or downward.

The Shift of the Demand Curve

The Demand Curve Shifts when the amount required of a particular commodity changes at each feasible price due to a change in one or more other parameters. Other elements, such as the consumer's income and tastes, as well as the prices of other commodities, which were expected to remain constant, changed.

In this case, the quantity Demanded is affected by a change in price as well as a change in one or more other parameters. As a result, for each price adjustment, Demand follows a distinct Curve.

This is known as the Demand Curve Shift. Depending on the forces influencing it, the Demand Curve might Shift to the left or right.

FAQs (Frequently Asked Questions)

1. Give examples of factors other than price that lead to a shift in the curve?

The various factors determining a shift in the curve are as follows.

1. Buyer’s Income: If the price remains constant and the income increases, the consumer can buy more goods. This results in a shift in the demand curve to the right.

2. Trends of Consumers: The market and buying trends change tremendously. For example, during the winter season, the demand for cold beverages decreases. No matter what the price is. It results in a leftward shift in the curve. 

3. Future Price Expectations: In some scenarios, the customers feel that there will be inflation. Due to this, they end up stocking the goods. This leads to a rightward shift in the curve.

4. Potential Buyers: The demand increases invariably with an increase in customers. There are times when due to good promotion strategies, the demand shoots up for a particular product. This again leads to a rightward shift.

2. How does the graph change in the case of movement in the demand curve?

The movement in the demand curve happens due to a change in the prices. This leads to an upward and downward shift in the demand curve. This also happens because all other factors remain constant, leading to such changes.

3. Which factors affect the supply and demand in the economy?

The factors which affect the supply of goods are:

  • Capacity of production

  • Cost of production of goods including the labour and raw-materials

  • Number of competitors and their levels

  • Some fluctuating factors include weather, availability of raw materials, etc.

The factors which affect the demand for goods are:

  • Preferences of the consumers

  • Changes in the pricing of the complementary commodities

  • Substitutes that are available for the same product

4. What is the difference between increase in demand and decrease in demand?

Increase in Demand

  • The demand curve shifts to the right as a result.

  • In the case of ordinary items, an increase in the consumer's income.

  • The cost of complementary goods is decreasing.

  • 's also known as the demand curve shift to the right.

  • Taste and preference shifts in favor of the commodity.

Decrease in Demand

  • It causes the demand curve to move to the left.

  •  The case of ordinary items, the consumer's income is reduced.

  • The cost of complementary goods is rising.

  • It's also known as the demand curve's leftward shift.

  • Changes in consumer tastes and preferences in opposition to the commodity.

5. What are the factors that affect individual demand?

Factors that affect individual demand are as follows:

  • Individual demand is influenced by a variety of factors.

  • Prices of connected goods have changed (substitutes and complements)

  • Changes in disposable income, the amount of which is linked to the demand elasticity of income.

  • Taste and preference changes. In the short term, tastes and preferences are thought to be fixed. For the aggregation of individual demand curves to produce market demand, the assumption of fixed preferences is required.

  • Expectations have shifted.

6. Define Demand curve?

In economics, a demand curve displays the relationship between a commodity's price (the y-axis) and the quantity of that commodity demanded at that price (the x-axis). Demand curves can be used to represent the price-quantity connection for a single consumer (an individual demand curve) or for all consumers in a given market (a market demand curve) (a market demand curve).

Demand curves are commonly considered to slope down due to the law of demand, which states that as the price of most things rises, so does the amount demanded.

7. Give reasons for the rightward shift of curve and leftward shift of curve?

  • Income growth for consumers

  • The price of its alternative goods has risen.

  • Price reductions on its ancillary goods

  • Changes in taste and choice that are favorable

  • Expected increase in the commodity's price in the future

  • The population is growing.

  • Income of customers has decreased.

  • Price reductions on its alternative items

  • Increase in the cost of its ancillary items

  • Changes in taste and choice that are unfavorable

  • Expected decrease in the price of the commodity in the future

  • Population decrease

8. What do you understand about the law of supply and demand?

  • According to the rule of demand, purchasers will demand less of an economic good at greater prices.

  • Suppliers will supply more of an economic good at higher prices, according to the law of supply..

  • The interaction of these two rules determines the real market prices and amount of items exchanged on a market.

  • Several independent factors can influence the form of market supply and demand, altering both market pricing and volumes.