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Movements Along and Shifts in Supply Curve

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Topics

  • Supply Curve
  • Movement Along Supply Curve
  • Shift of the Supply Curve
  • Factors Causing Shift in Supply Curve
  • Table: Expansion vs Increase in Supply
  • Table: Contraction of Supply vs. Decrease in Supply
  • Reasons Behind the Shift in Supply Curve
  • Real-Life Application
  • Key Point Summary
CISCE: Class 12

Supply Curve

Shows the quantity of a good producers will sell at different prices.

CISCE: Class 12

Movement Along Supply Curve

Occurs only when the price of the good changes. Other factors remain the same.

  • Expansion: Quantity supplied increases as price increases.
  • Contraction: Quantity supplied decreases as price decreases.

CISCE: Class 12

Shift of the Supply Curve

Happens due to changes in other factors (like technology, input prices). Price stays constant.

  • Increase in Supply: Producers supply more at the same price. The curve shifts right.
  • Decrease in Supply: Producers supply less at the same price. The curve shifts left.

CISCE: Class 12

Factors Causing Shift in Supply Curve

Shift Factor Increase in Supply (Right Shift) Decrease in Supply (Left Shift)
Technology Better techniques, more output Outdated techniques, less output
Input Prices Falling input costs Rising input costs
Prices of Other Goods Price drop for substitutes Price hike for substitutes
Taxes/Subsidies Lower taxes or higher subsidies Higher taxes or lower subsidies
Price Expectations Producers expect prices to fall Producers expect prices to rise
Number of Sellers More sellers enter the market. Sellers leave or exit the market.
CISCE: Class 12

Table: Expansion vs Increase in Supply

Expansion of Supply Increase in Supply
More supplied at higher price More supplied at same price
Caused by own price change Caused by other factors (not price)
Movement on same curve The whole curve shifts right
CISCE: Class 12

Table: Contraction of Supply vs. Decrease in Supply

Features Contraction of Supply Decrease in Supply
Cause The price of the good falls Factors other than price changes
Curve Movement Along same supply curve (SS) The entire curve shifts left
Price Decreases Constant
Quantity Supplied Decreases Decreases
Visual Aid
CISCE: Class 12

Reasons Behind the Shift in Supply Curve

CISCE: Class 12

Real-Life Application

Think of a road: Moving along the road (curve) is a journey at different speeds (prices). Changing the road itself is building a wider road (shift)—it can handle more cars (quantity) at once.

CISCE: Class 12

Key Point Summary

  • Expansion/Contraction: Caused by own price changes. Move up/down the same curve.
  • Increase/Decrease: Caused by other factors. The entire supply curve shifts.
  • Rightward Shift = More at same priceLeftward Shift = Less at same price.

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