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Demand and Supply. Chapter 3. Markets. Demand and Supply analysis takes place while looking at markets For now, we will be looking only at competitive markets These markets have many buyers and sellers influencing price and quantity. Demand Curve. Shows:
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Demand and Supply Chapter 3
Markets • Demand and Supply analysis takes place while looking at markets • For now, we will be looking only at competitive markets • These markets have many buyers and sellers influencing price and quantity
Demand Curve • Shows: • The various amounts of product consumers are willing and able to purchase at possible prices • Only shows demand for a specific period of time
Demand Curve – 2nd Period • Demand for Ice Cream pints
Demand Curve – 4th Period • Demand for Geek Chic table
Demand Curve – 6th Period • Demand for Jones’ Scones
Movements Along a Demand Curve • Caused by a price change of that good/service If… • Price increasesquantity demanded decreases Imagine a soda in the vending machine costs $5…would you still be willing to buy as many?
Movements Along a Demand Curve • If price decreases ….. Quantity demand increases What if a soda from the vending machine cost 10 cents? Would you buy more?
Movements Along the Demand Curve When there is a movement along the demand curve we say there is a CHANGE IN THE QUANTITY DEMANDED A movement along the curve is not a change in demand.
Law of Demand • Ceteris paribus, as the price of a good/service decreases, the quantity demanded increases • Ceteris paribus, as the price of a good/service increases, the quantity demanded decreases • Inverse relationship between price and quantity demanded • Demand curve is downward sloping
How do we know this is true? • Observation of consumer and business behavior • Diminishing marginal utility: as consumption of a good/service increases, consumers gain less and less satisfaction (marginal utility) from each additional unit. Therefore, they will only buy more units at lower prices because they value each extra unit less.
How do we know this is true? In other words…. With each additional starburst I eat I am less and less satisfied. Therefore, at some point, my starbursts are less valuable to me and I will want to pay less for them.
How do we know this is true? • Income Effect: as price decreases, real income increases, which allows consumers to buy more of that good/service If I have $10 to buy $1 packets of starburst, I can buy 10 of them. If the packets cost $0.50, I can buy 20. My income is getting me more as the price decreases!
How do we know this is true? • Substitution Effect: as price decreases, consumers will substitute more of the now relatively cheaper good As starbursts get cheaper…I might just start buying them to replace my $5 lunch.
4 4 4 + + = 4 0 0 4 8 0 4 8 0 24 4 8 12 Market Demand • Summation of individual market demand schedules
Market Demand • In other words, if I add up my demand curve for starburst, yours, yours, you in the back – yours too, and yes you also…I get the market demand for starbursts in this class.
Determinants of Demand What makes the demand curve shift?
1. Tastes/Preferences • Good/service becomes more popular increase in demand • Good/service becomes less popular decrease in demand
Tastes and Preferences Would you pick this? Or This?
Tastes and Preferences Would you pick this? Or This?
Tastes and Preferences It’s not just technology…
2. Population • Increase in number of buyersincrease in demand • More people move into areaincrease in demand • Decrease in number of buyersdecrease in demand • People move out of areadecrease in demand
Population Atlanta, GA = 432,427 Humansville, MO = 1,049 • Assume everyone wants at least one cell phone • Demand in ATL = 432,427 • Assume everyone wants at least one cell phone • Demand in Humansville – 1,049
Population Atlanta, GA = 432,427 Humansville, MO = 1,049 • Assume everyone wants at least one cell phone • Demand in ATL = 432,427 • Population in ATL decreases by 100,000 *all moving to Humansville • Demand in ATL = 332,427 • Assume everyone wants at least one cell phone • Demand in Humansville – 1,049 • Population in Humansville increases by 100,000 • Demand in Humansville – 101,049
3. Income • Income impacts our demand for products. • First must distinguish between a normal and inferior good • Taste Test Time!
3. Income • Normal Goods: • If income increasesincrease in demand for good/service • If income decreasesdecrease in demand for good/service
3. Income • Inferior Goods • If income increasesdecrease in demand for good/service • If income decreasesincrease in demand for good/service
4. Change in Price of Substitute • If the price of a substitute for good/service A decreases decrease in demand for good/service A • If the price of a substitute for good/service A increases increase in demand for good/service • Let’s examine my flavored water obsession….
5. Change in the Price of a Complementary Good • What is a complementary good? • One that complements the other! • One often consumed with the other.
5. Change in the Price of a Complementary Good • Two goods/service which go together • If the price of a complement for good/service A decreasesincrease in demand for good A • If the price of jelly goes down, I can get more of it and make more sandwiches. This means I’ll need more peanut butter so my demand for peanut butter goes up!
5. Change in the Price of a Complementary Good • Two goods/service which go together • If the price of a complement for good/service A increasesdecrease in demand for good A • If the price of jelly goes up, that means I won’t want to buy as much and I will have to make a different kind of sandwich…I will be sad and I also won’t need as much peanut butter.
6. Expectations/Fears • If consumers expect that the price of a good/service will increase in the future increase in demand for that good/service now • Think about when gas prices are due to go up…ie the gas shortage in 2008!
6. Expectations/Fears • If consumers expect that the price of a good/service will decrease in the future decrease in demand for that good/service now • Ever waited to buy a new phone because you knew a newer version was going to come out? This could be because a. you know that you want the new technology or b. YOU KNOW THE PRICE OF THE OLDER VERSION WILL BE LESS!!!
Supply • Schedule or a curve showing the various amounts of a product producers are willing and able to produce and make available for sale at each of a series of possible prices during a specified period of time
Movements along the Supply Curve • Caused by a price change of that good/service • Price increasesquantity supplied increases • Price decreasesquantity supplied decreases
Law of Supply • Ceteris paribus, as the price of a good/service increases, the quantity supplied increases • Ceteris paribus, as the price of a good/service decreases, the quantity supplied decreases • Direct relationship between price and quantity supplied • Supply curve is upward sloping
Why is the Law of Supply True? • To producers, price is = to revenue. Therefore, at higher prices, producers have more of an incentive to produce more • Increasing costs. As production (q) increases, the costs per unit may fall at first, but eventually they rise (decreasing returns to scale). • In order to cover these rising costs, the producer would want to charge a higher price.
Why is the Law of Supply True? • Labor supply: workers will supply more labor at higher wages (the “price” of their labor)
Determinants of Supply What causes the supply curve to shift?
1. Resource Prices • If costs of production decreaseincrease in supply • If costs of production increasedecrease in supply • Examples: wages, price of raw materials
Example: Oil rising • If the price of oil as an input rises, the supply of all the following goods will decrease. • Bicycle tires • Dresses • Mops • Umbrellas • Shampoo • Heart valves • Food preservatives • Nail polish • Tents • Telephones
2. Technology • If technology improvesincrease in supply • If technology deterioratesdecrease in supply
3. Subsidies and Taxes • If subsidies increaseincrease in supply - Subsidy: government helps to pay the cost of producing a good/service EX: Farming • If taxes increase or imposeddecrease in supply • If taxes decrease or removedincrease in supply
4. Prices of Other Goods • If prices of other goods/services, which a firm can easily adapt its plant and equipment to produce, increasedecrease in supply of good/service presently produced
4. Prices of Other Goods Example: • I have a plant where all I manufacture are soccer balls…every day, all day. • I discover that the price of footballs has increased relative to soccer balls • My plant can easily switch and make footballs instead of soccer balls and make more money • I will increase the amount of footballs I supply • And decrease the amount of soccer balls I supply
5. Expectations • Increases and decreases in supply depend on circumstances • If agriculture prices are expected to increase in the futuredecrease in supply (farmers might not bring as much to the market now) • If I know my crop is going to be worth more money next month…why pick it now and see it? I can wait a month and sell it when it’s worth more money!
5. Expectations • Increases and decreases in supply depend on circumstances • If manufacturing prices are expected to increase in the futureincrease in supply now • If I know that the cost of producing my product is going to go up in the future, I want to make as much of it before that happens as I can! I will make more now so I have a stockpile going when the costs of production go up!