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1.
C H A P T E R 3 Prepared By: Fernando
Quijano and Yvonn Quijano © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair Demand, Supply, and Market Equilibrium
2.
The Basic Decision-Making
Units © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • A firm is an organization that transforms resources (inputs) into products (outputs). Firms are the primary producing units in a market economy. • An entrepreneur is a person who organizes, manages, and assumes the risks of a firm, taking a new idea or a new product and turning it into a successful business. • Households are the consuming units in an economy.
3.
The Circular Flow
of Economic Activity © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • The circular flow of economic activity shows the connections between firms and households in input and output markets.
4.
Input Markets and
Output Markets • Output, or product, markets are the markets in which goods and services are exchanged. • Input markets are the markets in which resources—labor, capital, and land—used to produce products, are exchanged. • © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair Payments flow in the opposite direction as the physical flow of resources, goods, and services (counterclockwise).
5.
Input Markets © 2002
Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair Input markets include: • The labor market, in which households supply work for wages to firms that demand labor. • The capital market, in which households supply their savings, for interest or for claims to future profits, to firms that demand funds to buy capital goods. • The land market, in which households supply land or other real property in exchange for rent.
6.
Determinants of Household
Demand © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • • • • • • The price of the product in question. The income available to the household. The household’s amount of accumulated wealth. The prices of related products available to the household. The household’s tastes and preferences. The household’s expectations about future income, wealth, and prices. A household’s decision about the quantity of a particular output to demand depends on:
7.
Quantity Demanded © 2002
Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • Quantity demanded is the amount (number of units) of a product that a household would buy in a given time period if it could buy all it wanted at the current market price.
8.
Demand in Output
Markets © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • A demand schedule is a table showing how much of a given product a household would be willing to buy at different prices. • Demand curves are usually derived from demand schedules. ANNA'S DEMAND SCHEDULE FOR TELEPHONE CALLS QUANTITY PRICE DEMANDED (PER (CALLS PER CALL) MONTH) $ 0 30 0.50 25 3.50 7 7.00 3 10.00 1 15.00 0
9.
The Demand Curve •
The demand curve is a graph illustrating how much of a given product a household would be willing to buy at different prices. ANNA'S SCHED TELEPH PRICE (PER CALL) DEM AND ULE FOR ONE CALL S QUA NTIT Y DEM AND ED (CAL LS PER MON TH) $ 0 3 0 0.50 2 5 3.50 7 7.00 3 © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
10.
The Law of
Demand • The law of demand states that there is a negative, or inverse, relationship between price and the quantity of a good demanded and its price. • This means that demand curves slope downward. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
11.
Other Properties of
Demand Curves © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • Demand curves intersect the quantity (X)-axis, as a result of time limitations and diminishing marginal utility. • Demand curves intersect the (Y)-axis, as a result of limited incomes and wealth.
12.
Income and Wealth ©
2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • Income is the sum of all households wages, salaries, profits, interest payments, rents, and other forms of earnings in a given period of time. It is a flow measure. • Wealth, or net worth, is the total value of what a household owns minus what it owes. It is a stock measure.
13.
Related Goods and
Services © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • Normal Goods are goods for which demand goes up when income is higher and for which demand goes down when income is lower. • Inferior Goods are goods for which demand falls when income rises.
14.
Related Goods and
Services © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • Substitutes are goods that can serve as replacements for one another; when the price of one increases, demand for the other goes up. Perfect substitutes are identical products. • Complements are goods that “go together”; a decrease in the price of one results in an increase in demand for the other, and vice versa.
15.
Shift of Demand
Versus Movement Along a Demand Curve • A change in demand is not the same as a change in quantity demanded. • In this example, a higher price causes lower quantity demanded. • Changes in determinants of demand, other than price, cause a change in demand, or a shift of the entire demand curve, from DA to DB. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
16.
• When demand
shifts to the right, demand increases. This causes quantity demanded to be greater than it was prior to the shift, for each and every price level. A Change in Demand Versus a Change in Quantity Demanded © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
17.
A Change in
Demand Versus a Change in Quantity Demanded To summarize: Change in price of a good or service leads to Change in quantity demanded (Movement along the curve). Change in income, preferences, or prices of other goods or services leads to Change in demand (Shift of curve). © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
18.
The Impact of
a Change in Income • Higher income decreases the demand for an inferior good • Higher income increases the demand for a normal good © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
19.
The Impact of
a Change in the Price of Related Goods • Demand for complement good (ketchup) shifts left • Demand for substitute good (chicken) shifts right • • Price of hamburger rises Quantity of hamburger demanded falls © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
20.
From Household to
Market Demand © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • Demand for a good or service can be defined for an individual household, or for a group of households that make up a market. • Market demand is the sum of all the quantities of a good or service demanded per period by all the households buying in the market for that good or service.
21.
From Household Demand
to Market Demand • Assuming there are only two households in the market, market demand is derived as follows: © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
22.
Supply in Output
Markets © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • A supply schedule is a table showing how much of a product firms will supply at different prices. • Quantity supplied represents the number of units of a product that a firm would be willing and able to offer for sale at a particular price during a given time period. CLARENCE BROWN'S SUPPLY SCHEDULE FOR SOYBEANS QUANTITY SUPPLIED PRICE (THOUSANDS (PER OF BUSHELS BUSHEL) PER YEAR) $ 2 0 1.75 10 2.25 20 3.00 30 4.00 45 5.00 45
23.
The Supply Curve
and the Supply Schedule • A supply curve is a graph illustrating how much of a product a firm will supply at different prices. 6 5 4 3 2 1 0 0 10 20 30 40 50 Thousands of bushels of soybeans produced per year Price of soybeans per bushel ($) QUANTITY SUPPLIED PRICE (THOUSANDS (PER OF BUSHELS BUSHEL) PER YEAR) $ 2 1.75 2.25 3.00 4.00 5.00 0 10 20 30 45 45 CLARENCE BROWN'S SUPPLY SCHEDULE FOR SOYBEANS © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
24.
The Law of
Supply • The law of supply states that there is a positive relationship between price and quantity of a good supplied. • This means that supply curves typically have a positive slope. 6 5 4 3 2 1 0 © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair 0 10 20 30 40 50 Thousands of bushels of soybeans produced per year Price of soybeans per bushel ($)
25.
Determinants of Supply ©
2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • The price of the good or service. • The cost of producing the good, which in turn depends on: • The price of required inputs (labor, capital, and land), • The technologies that can be used to produce the product, • The prices of related products.
26.
A Change in
Supply Versus a Change in Quantity Supplied • A change in supply is not the same as a change in quantity supplied. • In this example, a higher price causes higher quantity supplied, and a move along the demand curve. • In this example, changes in determinants of supply, other than price, cause an increase in supply, or a shift of the entire supply curve, from SA to SB. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
27.
• When supply
shifts to the right, supply increases. This causes quantity supplied to be greater than it was prior to the shift, for each and every price level. A Change in Supply Versus a Change in Quantity Supplied © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
28.
A Change in
Supply Versus a Change in Quantity Supplied To summarize: Change in price of a good or service leads to Change in quantity supplied (Movement along the curve). Change in costs, input prices, technology, or prices of related goods and services leads to Change in supply (Shift of curve). © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
29.
From Individual Supply to
Market Supply © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • The supply of a good or service can be defined for an individual firm, or for a group of firms that make up a market or an industry. • Market supply is the sum of all the quantities of a good or service supplied per period by all the firms selling in the market for that good or service.
30.
Market Supply • As
with market demand, market supply is the horizontal summation of individual firms’ supply curves. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
31.
Market Equilibrium © 2002
Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair • The operation of the market depends on the interaction between buyers and sellers. • An equilibrium is the condition that exists when quantity supplied and quantity demanded are equal. • At equilibrium, there is no tendency for the market price to change.
32.
Market Equilibrium • Only
in equilibrium is quantity supplied equal to quantity demanded. • At any price level other than P0, the wishes of buyers and sellers do not coincide. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
33.
Market Disequilibria • • Excess demand,
or shortage, is the condition that exists when quantity demanded exceeds quantity supplied at the current price. When quantity demanded exceeds quantity supplied, price tends to rise until equilibrium is restored. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
34.
Market Disequilibria • • Excess supply,
or surplus, is the condition that exists when quantity supplied exceeds quantity demanded at the current price. When quantity supplied exceeds quantity demanded, price tends to fall until equilibrium is restored. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
35.
Increases in Demand
and Supply • Higher demand leads to higher equilibrium price and higher equilibrium quantity. • Higher supply leads to lower equilibrium price and higher equilibrium quantity. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
36.
Decreases in Demand
and Supply • Lower demand leads to lower price and lower quantity exchanged. • Lower supply leads to higher price and lower quantity exchanged. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
37.
Relative Magnitudes of
Change • The relative magnitudes of change in supply and demand determine the outcome of market equilibrium. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
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Relative Magnitudes of
Change • When supply and demand both increase, quantity will increase, but price may go up or down. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
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