240 likes | 486 Views
Demand. Chapter 3. What is demand?. The willingness and ability to purchase a good or service Demand = Willingness and ability to purchase. The Law of Demand. As a price of a good increases the quantity demanded of the good decreases and vice versa
E N D
Demand Chapter 3
What is demand? • The willingness and ability to purchase a good or service • Demand = Willingness and ability to purchase
The Law of Demand • As a price of a good increases the quantity demanded of the good decreases and vice versa • Quantity Demanded – is there a difference between demand and quantity demanded? • A demand for popcorn • Buying the popcorn 2 bags for 1 dollar is quantity demanded
Opposite Directions • Why do price and quantity demanded move in opposite directions? • Law of diminishing marginal utility • Candy experiment • As you obtain less utility from additional units you will only buy large quantities at low prices
Demand Schedule • Law of Demand says… • The up / down relationship is inverse relationship • A chart showing the inverse is a demand schedule
Demand Curve • 3-1 b shows the demand curve • Plotting connected points to show patterns • There are almost always patterns in economics
What happens when said curve shifts? • Demand curves shifting right or left show more or less demand of a product at price • What causes these shifts?
Income • As income goes up, people have the ability to purchase more of a good • This doesn’t necessarily mean they will • Normal Good – income goes up, purchase of that good goes up • Inferior Good – income goes up, purchase of that good goes down • Neutral Good – income goes up, purchase of that good stays the same
Preferences • People prefer certain products • Types of video games
Prices of Related Goods • Substitute Goods • Cars – Coffee / Tea – Video Games • Complements • Things that go together • Balls / Bats • PS2 / Games • Cars / Tires
Number of Buyers • Certain goods are demanded more in certain areas • Surfboards / CA v. SD
Change in Demand v. Change in Quantity Demanded • A change in demand refers to a shift in the curve • Change in quantity demanded = A movement from one point to another point on the same demand curve
Responsibilities of Buyers • Researching • Ethics in paying
Section 3 • Elasticity of Demand • Relationship between percentage change in in quantity demanded and the percentage change in price % Change in quantity demanded Elasticity of demand = ---------------------------------------------------- % Change in price
Demand • Elastic demand – when quantity demanded percentage changes more than the price • Inelastic demand – when quantity demanded percentage changes less than the price • Unit Elastic demand – when quantity demanded and price have similar relationships
Determinants of Elasticity • The number of substitutes has great effects on elasticity • Heart Medicines • Breads
Luxuries v. Necessities • Luxury – don’t need it to survive • Necessity – Food, medicine… • Which goods are elastic?
Percentages of Income • Making budgets on any level, percent of income is studied • Obvious which goods are more responsive to • Relationship to Time • Changing to adapt and adjust over time
What does it matter? • All versions of elasticity matter, because they relate to total revenue
Case 1 • A rise in price does not necessarily mean a rise in revenue Elastic demand + Price rise = TR Decrease
Case 2 • If demand is elastic and price is decreased, revenue will go up • Elastic Demand + Price Decline = TR Increase
Case 3 • Inelastic demand + Price Rise = TR Increase • If demand is inelastic a price rise will lead to a revenue increase
Case 4 • If demand is inelastic and price declines, total revenue will decrease • Inelastic demand + Price decline = TR Decrease
Unit Elastic • Equal forces in opposite directions • No change to total revenue