Lesson Objectives: By the end of this lesson you will be able to: *Explain the law of demand *Describe how the substitution effect and the income effect.

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Presentation transcript:

Lesson Objectives: By the end of this lesson you will be able to: *Explain the law of demand *Describe how the substitution effect and the income effect influence decisions. *Create a demand schedule for an individual and a market. *Interpret a demand graph using demand schedules.

Demand Demand is the desire to own something and the ability to pay for it. To have demand for a good or service, both of these conditions must be present. The Law of Demand Anyone who has ever spent money will easily understand the law of demand. The law of demand says: *When a goods’ price is lower, consumers will buy more it. *When the price is higher, consumers will buy less of it. All of us act out this law of demand in our everyday purchasing decisions. The price of a good influences your decision to buy. Law of Demand Video

Pizza Example: *Would you buy yourself a slice of pizza for lunch if it cost $2? *Would you buy the same slice of pizza if it cost $4? *How about $10 a slice? The law of demand is the result of not one pattern of behavior, but two separate patterns that overlap. 1.Substitution Effect-When the price of a good increases, people have an incentive to buy one of the alternatives as a substitute. This can also work if the reverse happens. 2.Income Effect- When the price of a good increases, your budget will not allow you to buy as much as you used to. You must cut back your purchases without substitution. Together, these effects explain why an increase in price decreases the amount purchased.

**It’s important to remember that Economists measure consumption in the amount of a good that is bought, not the amount of money spent to buy it.** A Demand Schedule To have demand for a good, you must be willing and able to buy it at the specified price. Demand means that you want the good and can afford to buy it. You may desperately want a new car, a laptop computer, or a trip to Alaska, but if you can’t truly afford any of these goods, then you do not demand them. A demand schedule- A demand schedule is a table that lists the quantity of a good that a person will purchase at various prices in a market.

Market Demand Schedules- When you add up the demand schedules of every buyer in a market, you can create a market demand schedule. A demand curve is a graphic representation of a demand schedule. **All demand schedules and demand curves reflect the law of demand, which states that higher prices will always lead to lower quantities demanded.** Limits of a Demand Curve (Video) Positive- A market demand curve can predict how people will change their buying habits when the price of a good rises or falls. Negative- A market demand curve is only accurate for one very specific set of market conditions. It cannot predict changing market conditions.