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1 Chapter 4 Demand, Supply and Markets These slides supplement the textbook, but should not replace reading the textbook
2 What is a market? A group of buyers and sellers with the potential to trade
3 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
4 What is a demand curve? A curve showing the quantities of a commodity demanded at various possible prices, other things constant
5 What is a change in quantity demanded? A movement along the demand curve in response to a change in the price, other things constant
6 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
7 What does an inverse relationship between price and quantity mean? It means that the two move in opposite directions
8 What is the law of demand? The quantity of a good demanded is inversely related to its price, other things constant
9 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
10 The Demand Schedule for Milk Price per quart Quantity demanded per Month (millions of quarts) abcdeabcde $
11 Millions of quarts per month Price per quart $ a b c d e D The Demand Curve for Milk
12 Why do consumers buy more as price decreases and less when price increases? Substitution effect Income effect
13 What is the substitution effect? When the price of a good falls, consumers will substitute it for other goods, which are now relatively expensive
14 What is money income? The number of dollars received per period of time, such as $100 per week
15 What is real income? Income measured in terms of the goods and services it can buy
16 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
17 What is individual demand? The demand for an individual consumer
18 What is market demand? The sum of the individual demands of all consumers in the market
19 What is a normal good? A good for which demand increases as consumer income rises
20 What is an inferior good? A good for which demand decreases as consumer income rises
21 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
22 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
23 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
24 An Increase in the Demand for Milk Millions of quarts per month Price per quart $ D D'
25 IMPORTANT - KNOW THE DIFFERENCE BETWEEN A CHANGE IN THE QUANTITY DEMANDED AND A CHANGE IN DEMAND
26 What can cause a change in the demand of a good or service? A change in...
27 Number in the market Consumer income Prices of related goods Consumer expectations Consumer demographics Consumer tastes
28 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
29 What is a supply curve? A curve showing the quantities of a good supplied at various prices, other things constant
30 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
31 What is a change in quantity supplied? A movement along the supply curve in response to a change in the price, other things constant
32 The Supply Schedule for Milk Quantity supplied per month (millions of quarts) Price per quart $
33 The Supply Curve for Milk Millions of quarts per month Price per quart $ S
34 What are relevant resources? Resources used to produce the good in question
35 What are alternative goods? Other goods that use some of the same types of resources used to produce the good in question
36 IMPORTANT - KNOW THE DIFFERENCE BETWEEN A CHANGE IN THE QUANTITY SUPPLIED AND A CHANGE IN SUPPLY
37 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
38 What can cause a change in the supply of a good or service? A change in...
39 Technology Prices of relevant resources Prices of alternative goods Producer expectations Number of producers
40 What happens when we put demand and supply together? Equilibrium
41 What is an equilibrium? An equilibrium is the point toward which the economy tends
42 What is disequilibrium? Usually a temporary mismatch between quantity supplied and quantity demanded as the market seeks equilibrium
43 What is a surplus? An excess quantity supplied over quantity demanded at a given price
44 Why is a surplus a disequilibrium? When there is a surplus the supplier will lower the price to get rid of the surplus
45 What is a shortage? An excess of quantity demanded over quantity supplied at a given price
46 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
47 What is market equilibrium? The condition that exists in a market when the plans of the buyers match the plans of the sellers
48 Equilibrium in the Milk Market Panel B: Market Curves Millions of quarts per month Price per quart $ D S Surplus Shortage
49 What causes an increase in equilibrium price? An increase in demand or a decrease in supply
50 Millions of quarts per month Price per quart 2024 $ Effects of an Increase in Demand S D' D
51 Effects of a Decrease in Supply Millions of quarts per month Price per quart D S S
52 What causes a decrease in equilibrium price? A decrease in demand or an increase in supply
53 Millions of quarts per month Price per quart 2024 $ Effects of a Decrease in Demand S D D
54 Effects of an Increase in Supply Millions of quarts per month Price per quart D S' S
55 P' S D' S' D Q' Units per period Price P 0 An Increase in Supply and Demand Panel A: Shift in Demand Dominates Q
56 Units per period Price P 0 An Increase in Supply and Demand Panel B: Shift in Supply Dominates Q P'' S Q'' S'' D D''
57 What is a price floor? A minimum legal price below which a good or service cannot be sold
58 Millions of wage earners Wage rate per hour 1424 $ Effects of a Price Floor for Labor (minimum wage) S D Surplus
59 What is a price ceiling? A maximum legal price above which a good or service cannot be sold
60 Thousands of rental units per month Price per unit 4060 $400 0 Effects of a Price Ceiling for Rent S D Shortage
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.
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