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Chapter 4 Demand, Supply and MarketsThese slides supplement the textbook, but should not replace reading the textbook
What is a market? A group of buyers and sellers with the potential to trade
What is demand? A relation showing the quantities of a good consumers are willing and able to buy at various prices during a given period of time, other things constant
What is a demand curve? A curve showing the quantities of a commodity demanded at various possible prices, other things constant
What is a change in quantity demanded?A movement along the demand curve in response to a change in the price, other things constant
Why do demand curves have a negative slope?At a higher price, consumers will buy fewer units; at a lower price, they will buy more units
What does an inverse relationship between price and quantity mean?It means that the two move in opposite directions
What is the law of demand?The quantity of a good demanded is inversely related to its price, other things constant
What is a demand schedule?Shows the specific quantity of a good or service that people are willing and able to buy at different prices
The Demand Schedule for Milk Quantity demanded per Month(millions of quarts) Price per quart a b c d e $1.25 1.00 0.75 0.50 0.25 8 14 20 26 32
The Demand Curve for Milk Millions of quarts per month$1.25 1.00 0.75 0.50 0.25 b c Price per quart d e D 8 14 20 26 32 Millions of quarts per month
Why do consumers buy more as price decreases and less when price increases?Substitution effect Income effect
What is the substitution effect?When the price of a good falls, consumers will substitute it for other goods, which are now relatively expensive
What is money income? The number of dollars received per period of time, such as $100 per week
What is real income? Income measured in terms of the goods and services it can buy
What is the income effect?A fall in the price of a good increases consumers’ real income, making them more able to purchase all goods, so the quantity demanded increases
What is individual demand?The demand for an individual consumer
What is market demand? The sum of the individual demands of all consumers in the market
What is a normal good? A good for which demand increases as consumer income rises
What is an inferior good?A good for which demand decreases as consumer income rises
What are complements? Goods that are related in such a way that an increase in the price of one leads to a decrease in the demand for the other
What are substitutes? Goods that are related in such a way that an increase in the price of one leads to an increase in the demand for the other
What is a change in demand?A shift in a given demand curve caused by a change in one of the nonprice determinants of demand for the good
An Increase in the Demand for Milk Millions of quarts per month$1.25 1.00 0.75 0.50 0.25 Price per quart D' D 8 14 20 26 32 Millions of quarts per month
IMPORTANT - KNOW THE DIFFERENCE BETWEEN A CHANGE IN THE QUANTITY DEMANDED AND A CHANGE IN DEMAND
What can cause a change in the demand of a good or service?
Number in the market Consumer income Prices of related goods Consumer expectations Consumer demographics Consumer tastes
What is supply? A relation showing the quantities of a good producers are willing and able to sell at various prices during a given time period, other things constant
What is a supply curve? A curve showing the quantities of a good supplied at various prices, other things constant
What is the law of supply?The quantity of a product supplied in a given time period is usually directly related to its price, other things constant
What is a change in quantity supplied?A movement along the supply curve in response to a change in the price, other things constant
The Supply Schedule for MilkQuantity supplied per month (millions of quarts) Price per quart $1.25 1.00 0.75 0.50 0.25 28 24 20 16 12
The Supply Curve for Milk Millions of quarts per month$1.25 1.00 0.75 0.50 0.25 Price per quart 12 16 20 24 28 Millions of quarts per month
What are relevant resources?Resources used to produce the good in question
What are alternative goods?Other goods that use some of the same types of resources used to produce the good in question
IMPORTANT - KNOW THE DIFFERENCE BETWEEN A CHANGE IN THE QUANTITY SUPPLIED AND A CHANGE IN SUPPLY
What is a change in supply?A shift in a given supply curve caused by a change in one of the nonprice determinants of the supply of the good
What can cause a change in the supply of a good or service?
Technology Prices of relevant resources Prices of alternative goods Producer expectations Number of producers
What happens when we put demand and supply together?Equilibrium
What is an equilibrium? An equilibrium is the point toward which the economy tends
What is disequilibrium?Usually a temporary mismatch between quantity supplied and quantity demanded as the market seeks equilibrium
What is a surplus? An excess quantity supplied over quantity demanded at a given price
Why is a surplus a disequilibrium?When there is a surplus the supplier will lower the price to get rid of the surplus
What is a shortage? An excess of quantity demanded over quantity supplied at a given price
Why is a shortage a disequilibrium?When there is a shortage consumers will bid up the price to determine who gets and who does not get
What is market equilibrium?The condition that exists in a market when the plans of the buyers match the plans of the sellers
Equilibrium in the Milk Market Millions of quarts per monthPanel B: Market Curves S $1.25 1.00 0.75 0.50 0.25 Surplus Price per quart Shortage D 14 16 20 24 26 Millions of quarts per month
What causes an increase in equilibrium price?An increase in demand or a decrease in supply
Effects of an Increase in Demand Millions of quarts per month$1.00 Price per quart 0.75 D' D 20 24 Millions of quarts per month
Effects of a Decrease in Supply Millions of quarts per monthPrice per quart 0.75 0.50 D 20 26 Millions of quarts per month
What causes a decrease in equilibrium price?A decrease in demand or an increase in supply
Effects of a Decrease in Demand Millions of quarts per month$1.00 Price per quart 0.75 D D’ 20 24 Millions of quarts per month
Effects of an Increase in Supply Millions of quarts per monthPrice per quart 0.75 0.50 D 20 26 Millions of quarts per month
An Increase in Supply and Demand Panel A: Shift in Demand DominatesPrice P D' D Q Q' Units per period
An Increase in Supply and Demand Panel B: Shift in Supply DominatesPrice P P'' D'' D Q Q'' Units per period
What is a price floor? A minimum legal price below which a good or service cannot be sold
S D Effects of a Price Floor for Labor (minimum wage) Surplus $6.00 14Wage rate per hour D 14 24 Millions of wage earners
What is a price ceiling? A maximum legal price above which a good or service cannot be sold
D S Effects of a Price Ceiling for Rent $400 Shortage 40 60Price per unit $400 Shortage 40 60 Thousands of rental units per month
Demand, Supply, and Markets 1 © 2012 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part, except for.
3 - 1 Copyright McGraw-Hill/Irwin, 2005 Markets Demand Defined Demand Graphed Changes in Demand Supply Defined Supply Graphed Changes in Supply Equilibrium.
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