The Laws of Supply and Demand. What are the basic laws of supply and demand? What causes shifts in the curves of supply and demand?
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1 The Laws of Supply and Demand What are the basic laws of supply and demand? What causes shifts in the curves of supply and demand?
2 What is supply and demand? Supply and demand is how economists track the dividing of resources & their value within a society Two (2) goals: How much of a product do we have? Is the demand for that product strong?
3 What is the law of supply? The Law of Supply asks: How much of a good or service is a company willing to produce at a price? Hypothesis? Answer: If nothing changes, a company will produce a greater quantity of products when the price for that good is high. (WHY?)
4 Supply Curve for Xbox 360 Price per Xbox $ S h g f e c b a S QuickTime and a decompressor are needed to see this picture Quantity Supplied in Billions of Xboxes per Year Copyright 2003 South-Western/Thomson Learning. All rights reserved.
5 What are the factors that determine supply? P.I.G. T.O.E.S P roductivity (workers, machines, and/or assembly) I nputs (Change in the price of materials needed to make the good) G overnment Actions (Subsidies, Taxes, and Regulations) T echnology (Improvements in machines and production) O utputs (Price changes in other products) E xpectations (outlook of the future) S ize of Industry (Number of companies in the industry)
6 What is the law of demand? The Law of Demand asks: What is the willingness of consumers to buy a product at price? Hypothesis? Answer: If nothing else changes, the demand of a good is greatest for consumers when the price is low. (WHY?)
7 Demand Curve for Xbox 360 Price per XBox $500 $ D A B C E F G QuickTime and a decompressor are needed to see this picture. H D Quantity Demanded in Billions of Xboxes per Year 75 Copyright 2003 South-Western/Thomson Learning. All rights reserved.
8 What are the factors that determine demand? P.O.I.N.T. P rice of other goods (substitute or complementary) O utlook (consumer expectation of the future) I ncome (normal goods versus inferior goods) N umber of potential customers (pop.of market) T aste (fads or trends)
9 How does a supply curves move? A supply curve shifts whenever a factor that affects the supply of the good (other than price) changes RIGHT: Increase in supply (at all prices) LEFT: Decrease in supply (at all prices)
10 What factors cause a shift in a supply curve? Two (2) reasons: A change in cost of production Increase = LEFT Decrease = RIGHT The role of technology in production Increase =RIGHT Decrease = LEFT
11 Scenario #1 Our Xbox factory finds out that our workers are getting a 25% pay raise (increase in the cost of labor) What happens to the supply curve?
12 Supply Curve for Xbox 360 $ S S Price per Xbox S Increase in labor pay = more production costs = decrease in the # of Xboxs 200 S Quantity Supplied in Billions of Xboxes per Year Copyright 2003 South-Western/Thomson Learning. All rights reserved.
13 Scenario #2 Our Xbox factory invents a technology that produces twice as many Xboxs in a day as before. What happens to the supply curve?
14 Supply Curve for Xbox 360 Price per Xbox $ Increase technology = more Xboxs produced = increase in the # of Xboxs S S 200 S S Quantity Supplied in Billions of Xboxes per Year Copyright 2003 South-Western/Thomson Learning. All rights reserved.
15 Scenario #3 The CEO of our Xbox factory decides to increase the price of our Xboxs as a way to make more profit. What happens to the supply curve?
16 Supply Curve for Xbox 360 $500 S Price per Xbox Increase in price = no shift in the supply curve 200 S Quantity Supplied in Billions of Xboxes per Year Copyright 2003 South-Western/Thomson Learning. All rights reserved.
17 How does a demand curves move? A demand curve shifts whenever a factor that affects the demand of the good (other than price) changes RIGHT: Increase in demand (at all prices) LEFT: Decrease in demand (at all prices)
18 What factors cause a shift in a demand curve? Three (3) reasons: Change in a consumer s income Increase = RIGHT Decrease = LEFT Change in the price of a substitute goods Increase = LEFT Decrease = RIGHT Change in consumer tastes Increase = RIGHT Decrease = LEFT
19 Scenario #1 A neighboring factory that produces Xbox games drops their price as part of a late winter sale What happens to our demand curve?
20 Demand Curve for Xbox 360 Price per XBox $500 $ D Price for Xbox games drops = increase in demand for Xbox related products = increase in Xbox demand D Quantity Demanded in Billions of Xboxes per Year 75 Copyright 2003 South-Western/Thomson Learning. All rights reserved.
21 Scenario #2 A rival company cuts the price of their version of the Xbox, making it half the price of our product. What happens to our demand curve?
22 Demand Curve for Xbox 360 D Price per XBox $500 $ Change in the price of a sub. good= decrease in Xbox demand D Quantity Demanded in Billions of Xboxes per Year 75 Copyright 2003 South-Western/Thomson Learning. All rights reserved.
23 Scenario #3 The local paper mill in a small town (where Xbox sales are high) closes, causing many people to loose their jobs. What happens to our demand curve?
24 Demand Curve for Xbox 360 Price per XBox $500 $ D Decrease in consumer income = less $$$ for luxury goods = decrease in Xbox demand D Quantity Demanded in Billions of Xboxes per Year 75 Copyright 2003 South-Western/Thomson Learning. All rights reserved.
25 What is equilibrium? Equilibrium is when quantity supplied and quantity demanded are equal Perfection!!!! Many companies strive to reach economic equilibrium
26 Supply-Demand Market Equilibrium $500 D A a S Price per Xbox g E 200 S D Quantity in Billions of Xbox 360 per Year Copyright 2003 South-Western/Thomson Learning. All rights reserved.
27 Excess Demand: Not Enough Excess demand is when the quantity demanded exceeds the quantity supplied at a given price Also know as a shortage When this happens, price tends to rise until equilibrium is restored Black markets Rationing / Price Capping Violence
28 Prohibition (1920 s)
29 The 1973 Oil Embargo
30 Price Ceiling / Price Capping
31 Excess Supply: Having too much Excess supply is when the supplied exceeds quantity demanded at a given price. Also known as a surplus When this happens, prices tend to fall until equilibrium is restored Little re-sale value Lack of consumer interest Worthlessness
32 The Pet Rock (1970 s)
33 Disco Music (1970 s s)
34 Beanie Babies (1990 s)
35 Price Floor
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