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Ch03
1.
The Basic Decision-Making
Units • 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
2.
The Circular Flow
of Economic Activity • The circular flow of economic activity shows the connections between firms and households in input and output markets. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
3.
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, • Payments flow in the opposite and land—used to direction as the physical flow of produce products, are resources, goods, and services (counterclockwise). exchanged. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
4.
Input Markets
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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
5.
Determinants of Household
Demand A household’s decision about the quantity of a particular output to demand depends on: • 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
6.
Quantity Demanded
• 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
7.
Demand in Output
Markets ANNA'S DEMAND • A demand schedule SCHEDULE FOR is a table showing TELEPHONE CALLS how much of a given PRICE QUANTITY DEMANDED product a household (PER (CALLS PER would be willing to $ CALL) 0 MONTH) 30 buy at different prices. 0.50 25 3.50 7 • Demand curves are 7.00 3 10.00 1 usually derived from 15.00 0 demand schedules. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
8.
The Demand Curve
ANNA'S DEMAND SCHEDULE FOR • The demand curve is TELEPHONE CALLS a graph illustrating PRICE QUANTITY DEMANDED how much of a given (PER CALL) (CALLS PER MONTH) product a household $ 0 0.50 30 25 would be willing to 3.50 7 buy at different prices. 7.00 3 10.00 1 15.00 0 © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
9.
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
10.
Other Properties of
Demand Curves • 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
11.
Income and Wealth
• 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
12.
Related Goods and
Services • 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
13.
Related Goods and
Services • 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
14.
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
15.
A Change in
Demand Versus a Change in Quantity Demanded • 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
16.
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
17.
The Impact of
a Change in Income • Higher income • Higher income decreases the demand increases the demand for an inferior good for a normal good © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
18.
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
19.
From Household to
Market Demand • 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
20.
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
21.
Supply in Output
Markets CLARENCE BROWN'S • A supply schedule is a table SUPPLY SCHEDULE showing how much of a product FOR SOYBEANS firms will supply at different QUANTITY SUPPLIED prices. PRICE (THOUSANDS (PER OF BUSHELS • Quantity supplied represents the BUSHEL) PER YEAR) $ 2 0 number of units of a product that 1.75 2.25 10 20 a firm would be willing and able to 3.00 30 offer for sale at a particular price 4.00 5.00 45 45 during a given time period. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
22.
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. CLARENCE BROWN'S 6 Price of soybeans per bushel ($) SUPPLY SCHEDULE FOR SOYBEANS 5 QUANTITY SUPPLIED 4 PRICE (THOUSANDS (PER OF BUSHELS 3 BUSHEL) PER YEAR) 2 $ 2 0 1.75 10 1 2.25 20 3.00 30 0 4.00 45 5.00 45 0 10 20 30 40 50 Thousands of bushels of soybeans produced per year © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
23.
The Law of
Supply 6 • The law of supply Price of soybeans per bushel ($) 5 states that there is a 4 positive relationship 3 between price and 2 1 quantity of a good 0 supplied. 0 10 20 30 40 50 Thousands of bushels of soybeans • This means that produced per year supply curves typically have a positive slope. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
24.
Determinants of Supply
• 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
25.
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
26.
A Change in
Supply Versus a Change in Quantity Supplied • 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
27.
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
28.
From Individual Supply
to Market Supply • 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
29.
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
30.
Market Equilibrium
• 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. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
31.
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
32.
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
33.
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
34.
Increases in Demand
and Supply • Higher demand leads to • Higher supply leads to higher equilibrium price and lower equilibrium price and higher equilibrium quantity. higher equilibrium quantity. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
35.
Decreases in Demand
and Supply • Lower demand leads to • Lower supply leads to lower price and lower higher price and lower quantity exchanged. quantity exchanged. © 2002 Prentice Hall Business Publishing Principles of Economics, 6/e Karl Case, Ray Fair
36.
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
37.
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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