Movement and Shift In Supply Curve | Economics

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Tutorial Topic: What is movement and shift in supply curve, supply curve shifts, Shift and Movement along Supply Curve – Answered

Movement and Shift In Supply Curve

Movement In Supply Curve

Movement in the supply curve is when the commodity experience change in both the quantity supply and price, causing the curve to move in a specific direction.

Shift in Supply Curve

The shift in the supply curve is when, the price of the commodity remains constant, but there is a change in quantity supply due to some other factors, causing the curve to shift to a particular side.

Read: Supply Curve | Definition, Type, Example


Shifts and Movement along Supply Curve

In economics, like demand, change in quantity supplied and change in supply are two different concepts.

Change in quantity supplied occurs due to rise or fall in product prices while other factors are constant.

  • It can be measured by the movement of the supply curve.
  • The term, Change in quantity supplied refers to expansion or contraction of supply.

Change in supply refers to increase or decrease in the supply of a product due to various determinants of supply other than price (in this case, price is constant).

  • It is measured by shifts in the supply curve.
  • The terms, while a change in supply means an increase or decrease in supply.

Read: What is Supply? Definition, Type, Example


Expansion and Contraction of Supply

Expansion or Extension of Supply

Expansion or extension of Supply: When there are large quantities of a good supplied at higher prices, it is known as expansion or extension of supply.

Figure shows the movement of the supply curve:

Expansion and Contraction of supply
Figure: Expansion and Contraction of supply

In Figure, quantity supplied at price OP1 is OQ1. When the price rises to OP2, the quantity supplied also increases to OQ2, which is shown by the upward movement from A1 to A2 (it is pointed by the direction of the arrow between A1 to A2). This upward movement is known as the expansion of supply.

Contraction Of Supply

Contraction of supply occurs when smaller quantities of goods are supplied even at reduced prices.

On the contrary, a fall in price from OP1 to OP3 results in a decrease in supply from OQ1 to OQ2. This movement from A1 to A3 shown by the arrow pointed downwards is known as the contraction of supply. Thus, the movement from A1 to A3 is the representation of the expansion and contraction of the quantity supplied.

Read: Law of Supply | Definition, Example, Exceptions, Assumptions


Increase and Decrease In Supply

Increase In Supply

An increase in supply takes place when a supplier is willing to offer large quantities of products in the market at the same price due to various reasons, such as improvement in production techniques, fall in prices of factors of production, and reduction in taxes.

Decrease In Supply

A decrease in supply occurs when a supplier is willing to offer small quantities of products in the market at the same price due to increase in taxes, low agricultural production, high costs of labour, unfavourable weather conditions, etc.

Read: Supply Schedule | Definition, Example, [Individual & Market]


Supply curve shifts

A shift takes place in supply curve due to the increase or decrease in supply, which is shown in Figure.

Increase and Decrease in Supply
Figure: Increase and Decrease in Supply

In Figure, an increase in supply in indicated by the shift of the supply curve from S1 to S2. Because of an increase in supply, there is a shift at the given price OP, from A1 on supply curve S1 to A2 on supply curve S2. At this point, large quantities (i.e. Q2 instead of Q1) are offered at the given price OP.

On the contrary, there is a shift in the supply curve from S1 to S3 when there is a decrease in supply. The amount supplied at OP is decreased from OQ1 to OQ3 due to a shift from A1 on supply curve S1 to A3 on supply curve S3.

However, a decrease in supply also occurs when producers sell the same quantity at a higher price (which is shown in Figure 3.6) as OQ1 is supplied at a higher price OP2.

Read: Movement and Shift In Demand Curve | Economics


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