1. Supply Economics Unit 4, Lesson 1
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2. Objectives Define supply. Explain the law of supply.
Analyze the relationship between cost of production and cost that suppliers are willing to sell product.
Construct a supply schedule and supply cure.
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3. Supply
The amount that producers are willing and able to offer for sale at various prices.
Microsoft. (Designer). (2010). Clip art [Web Graphic]. Retrieved from
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4. Profit is what motivates producers so the
higher the profit, the greater amount
they will produce.
Microsoft. (Designer). (2010). Clip art [Web Graphic]. Retrieved from
©2012, TESCCC

5. Law of Supply
As the price of an item goes up, the quantity supplied will increase; as the price of an item goes down, the quantity supplied will decrease.
P QS or P QS
Direct relationship between price and quantity supplied (QS)
Given production costs, a higher price means greater profits and an incentive for producers to increase quantity supplied.
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6. Supply Schedule Price Quantity Supplied $ 5 50 $ 4 40 $ 3 30 $ 2 20$ $ $ $ $
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7. Supply S
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8. Market Supply Schedule
Shows prices and total quantity supplied by all producers in the industry.
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9. Supply and Elasticity
Measure of way suppliers respond to a change in price
Elastic supply > 1
Inelastic supply < 1
Unitary elastic = 1
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10. Elasticity of Supply and Time
Short Run – Supply inelastic. It takes time to switch production and in the short run it is hard for suppliers to respond to a price change
Long Run – Supply becomes more elastic
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11. Elasticity
For example, if the price of apples increases dramatically, an apple producer cannot increase his output immediately. It will take some time for him to plant new apple trees and wait until they produce fruit.
Microsoft. (Designer). (2010). Clip art [Web Graphic]. Retrieved from
©2012, TESCCC