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Home Theory of supply Difference Between Shift in Supply Curve and Movement


Difference Between Shift in Supply Curve and Movement:


Movement Along with the Same Supply Curve:


While explaining the law of supply we have stated that as price rise, the quantity supplied increases and as price falls the quantity supplied increases and as price provided other things remain the same. This change in the quantity supplied of a commodity is a movement of one price quantity combination to another on the same supply curve. Such a movement at varying prices is now illustrated with the help of the supply curve given in figure 5.2.





Figure of Movement:


In the above figure (5.2) at price "aT" ($3.00), "aT" 50 units quantity is supplied. When price rises to dL ($7.0), the quantity supplied by the producers increases to OL (110 units). The change in quantity supplied at varying prices is referred as movement along the same supply curve.


Shifts in Supply Curve:


Shifts in supply curve means changes in supply. While explaining the law of supply, we have stated that that other things remaining the same (ceteris paribus) the amount of the commodity offered fore sale increases with the rise in price and decreases with a fall in price. When there is an increase in supply due to one or more than one non-price factor (which was held constant) such as production techniques, resource prices, changes in the price of other commodities, etc., there is a rise in supply. The entire supply curve shifts to the right of original supply curve indicating that more quantity is offered fore sale at the same price per time period.


If due to one or a combination of non-price factors, less quantity is brought into the market fore sale at each price, the supply is said to have fallen. In case of fall in supply, the supply curve shifts to the left of the original supply curve. The rise and fall of supply curve (shifts in supply curve) is explained with the help of an imaginary schedule and a diagram.


Schedule of Shifts in Supply Curve:


Supply schedule of shifts:

Price per shirt

(Dollars )

Original quantity

Supplied per


Rise in supply

Fall in supply


50 200 320 140
40 160 200 100
30 100 150 70
20 39 100 15


Figure of Shifts in Supply Curve:



In the figures (5.3) SS/ in the original supply curve S2S2 to the right of the original supply curve shows an increase in the quantity supplied at each price. S3S3 supply curve to the left of original supply curve to the left of original supply curve indicates a decrease in supply at each price over a specified period of time.

Relevant Articles:

Meanings of Supply
Law of Supply
Difference Between Shift in Supply Curve and Movement
Determinants of Supply
Backward Bending Supply Curve of Labor

Principles and Theories of Micro Economics
Definition and Explanation of Economics
Theory of Consumer Behavior
Indifference Curve Analysis of Consumer's Equilibrium
Theory of Demand
Theory of Supply
Elasticity of Demand
Elasticity of Supply
Equilibrium of Demand and Supply
Economic Resources
Scale of Production
Laws of Returns
Production Function
Cost Analysis
Various Revenue Concepts
Price and output Determination Under Perfect Competition
Price and Output Determination Under Monopoly
Price and Output Determination Under Monopolistic/Imperfect Competition
Theory of Factor Pricing OR Theory of Distribution
Principles and Theories of Macro Economics
National Income and Its Measurement
Principles of Public Finance
Public Revenue and Taxation
National Debt and Income Determination
Fiscal Policy
Determinants of the Level of National Income and Employment
Determination of National Income
Theories of Employment
Theory of International Trade
Balance of Payments
Commercial Policy
Development and Planning Economics
Introduction to Development Economics
Features of Developing Countries
Economic Development and Economic Growth
Theories of Under Development
Theories of Economic Growth
Agriculture and Economic Development
Monetary Economics and Public Finance

History of Money

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