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# BAEB602 Chapter 2: Demand and Supply (Part 2)

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### BAEB602 Chapter 2: Demand and Supply (Part 2)

1. 1. BAEB602 MICROECONOMICS CHAPTER 2 DEMAND AND SUPPLYPREPARED BY:Nur Suhaili RamliSchool of Marketing andEntrepreneurship (SoME)FACULTY OF BUSINESS AND MANAGEMENT
2. 2. CHAPTER 2: DEMAND AND SUPPLYLearning outcome TOPIC  Student able to define theory of demand  Student able to understand the Law of Demand  Student able to understand change in quantity demanded versus change in demand  Student able to understand factors that influence market demand Slide 2 of 17
3. 3. CHAPTER 2: DEMAND AND SUPPLYLearning objectives TOPIC  Identify the x and y axes.  Identify the origin. on a graph.  Identify x and y coordinates of a point.  Plot points on a graph  Applying demand and supply concepts Slide 3 of 17
4. 4. CHAPTER 2: DEMAND AND SUPPLYElements of a graph TOPIC  We often use graphs to give us a picture of the relationships between variables. Lets first look at the basic construction of graphs.  A graph is a visual representation of a relationship between two variables, x and y.  A graph consists of two axes called the x (horizontal) and y (vertical) axes. These axes correspond to the variables we are relating. In economics we will usually give the axes different names, such as Price and Quantity.  The point where the two axes intersect is called the origin. The origin is also identified as the point (0, 0). Slide 4 of 17
5. 5. CHAPTER 2: DEMAND AND SUPPLYElements of a graph TOPIC Slide 5 of 17
6. 6. CHAPTER 2: DEMAND AND SUPPLYCoordinates of points – Identify x coordinate TOPIC  A point is the basic relationship displayed on a graph.  Each point is defined by a pair of numbers containing two coordinates. A coordinate is one of a set of numbers used to identify the location of a point on a graph.  Each point is identified by both an x and a y coordinate. In this unit you will learn how to find both coordinates for any point. You will also learn the correct notation for labeling the coordinates of a point. You will first begin by identifying the x-coordinate of a point.  The x-coordinate of a point is the value that tells you how far from the origin the point is on the horizontal, or x-axis. Slide 6 of 17
7. 7. CHAPTER 2: DEMAND AND SUPPLYExercise 2.2 TOPIC Refer to diagram below, I identify the following: 1) Draw a straight line from the point directly to the x-axis. 2) The number where the line hits the x-axis is the value of the x-coordinate. Slide 7 of 17
8. 8. CHAPTER 2: DEMAND AND SUPPLYExercise 2.2 TOPIC Refer to diagram below, I identify the following: 1) Draw a straight line from the point directly to the x-axis. 2) The number where the line hits the x-axis is the value of the x-coordinate. Answer: At the above is a graph with two points, B and D. In this figure: The x-coordinate of point B is 100. The x-coordinate of point D is 400. Slide 8 of 17
9. 9. CHAPTER 2: DEMAND AND SUPPLYCoordinates of points – Identify y coordinate TOPIC  As we already mentioned, each point is defined by two coordinates, the x and the y coordinate. Now that you know how to find the x-coordinate of a point, you have to be able to find the y-coordinate. The y-coordinate of a point is the value that tells you how far from the origin the point is on the vertical, or y-axis. Slide 9 of 17
10. 10. CHAPTER 2: DEMAND AND SUPPLYExercise 2.3 TOPIC According to the given diagram, Identify the following: 1) To find the y-coordinate of a point on a graph: Draw a straight line from the point directly to the y-axis. 2) The number where the line hits the axis is the value of the y-coordinate. Slide 10 of 17
11. 11. CHAPTER 2: DEMAND AND SUPPLYExercise 2.3 TOPIC According to the given diagram, Identify the following: 1) To find the y-coordinate of a point on a graph: Draw a straight line from the point directly to the y-axis. 2) The number where the line hits the axis is the value of the y-coordinate. Answer: At above graph, we now identify the y-coordinate for each. The y-coordinate of point B is 400. The y-coordinate of point D is 100. Slide 11 of 17
12. 12. CHAPTER 2: DEMAND AND SUPPLYNotation for Identifying Points TOPIC  Once you have the coordinates of a point you can use the ordered pair notation for labeling points. The notation is simple. Points are identified by stating their coordinates in the form of (x, y). Note that the x-coordinate always comes first. For example, in the figure weve been using, we have identified both the x and y coordinate for each of the points B and D. The x-coordinate of point B is 100.  The y-coordinate of point B is 400.  Coordinates of point B are (100, 400)  The x-coordinate of point D is 400.  The y-coordinate of point D is 100.  Coordinates of point D are (400, 100) Slide 12 of 17
13. 13. CHAPTER 2: DEMAND AND SUPPLYExercise 2.4 TOPIC Based on the following graph, identify the following: 1) Which point is on the y-axis? 2) Which point is labeled (20, 60)? 3) Which point(s) have a y-coordinate of 30? Slide 13 of 17
14. 14. CHAPTER 2: DEMAND AND SUPPLYExercise 2.4 TOPIC Based on the following graph, identify the following: 1) Which point is on the y-axis? Answer: Point A 2) Which point is labeled (20, 60)? Answer: Point B 3) Which point(s) have a y-coordinate of 30? Answer: Point A & C Slide 14 of 17
15. 15. CHAPTER 2: DEMAND AND SUPPLYPlotting graph TOPIC Slide 15 of 17
16. 16. CHAPTER 2: DEMAND AND SUPPLYLaw of demand TOPIC  According to the law of demand, the lower the price of a good, the larger the quantity consumers wish to purchase.  The relationship will hold only if the other factors affecting consumption, such as income and preferences. Tips: In drawing a demand curve, we assume that incomes, the prices of related goods, and preferences are the same at all points on the curve. Why? It is because to identify the independent influence of the good’s own price on consumer purchases. If incomes, price of related goods or preferences do change, the entire demand curve shifts. Slide 16 of 17
17. 17. CHAPTER 2: DEMAND AND SUPPLYLaw of demand TOPIC  The law of demand states that, if all other factors remain equal, the higher the price of a good, the less people will demand that good. In other words, the higher the price, the lower the quantity demanded. The amount of a good that buyers purchase at a higher price is less because as the price of a good goes up, so does the opportunity cost of buying that good. As a result, people will naturally avoid buying a product that will force them to forgo the consumption of something else they value more. The chart below shows that the curve is a downward slope. Slide 17 of 17
18. 18. CHAPTER 2: DEMAND AND SUPPLYLaw of demand TOPIC A, B and C are points on the demand curve. Each point on the curve reflects a direct correlation between quantity demanded (Q) and price (P). So, at point A, the quantity demanded will be Q1 and the price will be P1, and so on. The demand relationship curve illustrates the negative relationship between price and quantity demanded. The higher the price of a good the lower the quantity demanded (A), and the lower the price, the more the good will be in demand (C) Slide 18 of 17
19. 19. CHAPTER 2: DEMAND AND SUPPLYA demand curve TOPIC  The demand curve D shows the quantity of DVD players that consumers will purchase at alternative prices. Its negative slope reflects the law of demand: more DVD players are purchased at a lower price. Slide 19 of 17
20. 20. CHAPTER 2: DEMAND AND SUPPLYAn increase in demand TOPIC  For a demand curve, other influences besides the price of the good being examined (consumers’ income, consumers’ preferences, prices of related goods, and so on) are held constant at all points along the curve. Changes in these underlying factors normally cause the demand curve to shift. Here, an increase in consumers’ incomes causes the demand curve to shift from D to D’ because DVD players are assumed to be a normal good. Exam Hint: 1) Identify what is a normal good definition? 2) What are the factors that affect increase in demand? Slide 20 of 17
21. 21. CHAPTER 2: DEMAND AND SUPPLYAn Increase in demand TOPIC Slide 21 of 17
22. 22. CHAPTER 2: DEMAND AND SUPPLYLaw of supply TOPIC  According to the law of supply, the higher the price of a good, the larger the quantity firms want to produce. Supply curves for most goods slope upward. Basically, the upward slope reflects the fact that per-unit opportunity costs rise when more units are produced, so a higher price is necessary to elicit a greater output. Slide 22 of 17
23. 23. CHAPTER 2: DEMAND AND SUPPLYLaw of supply TOPIC  Like the law of demand, the law of supply demonstrates the quantities that will be sold at a certain price. But unlike the law of demand, the supply relationship shows an upward slope. This means that the higher the price, the higher the quantity supplied. Producers supply more at a higher price because selling a higher quantity at a higher price increases revenue. Slide 23 of 17
24. 24. CHAPTER 2: DEMAND AND SUPPLYA supply curve TOPIC The supply curve S shows the quantity of DVD players firms will be willing to produce at alternative prices. It generally slope upwards, indicating that a higher price will result in increased output. Slide 24 of 17
25. 25. CHAPTER 2: DEMAND AND SUPPLYAn increase in supply TOPIC For a supply curve, technology and input supply conditions are held constant at all point alone curve. Changes in these underlying factors normally cause the supply curve to shift. Here, a technological change causes the supply curve to shift from S to S’ Slide 25 of 17
26. 26. CHAPTER 2: DEMAND AND SUPPLYShift in Versus Movement along Supply Curve TOPIC 1) Movement along a given supply curve  A change in quantity supplied that occurs in response to a change in the good’s selling price, other factors holding constant. 2) Shift of a supply curve  A change in the supply curve itself that occurs when the other factors, besides price, that affect output change. Slide 26 of 17
27. 27. CHAPTER 2: DEMAND AND SUPPLYShift Vs Movement TOPIC  For economics, the “movements” and “shifts” in relation to the supply and demand curves represent very different market phenomena: 1. Movements A movement refers to a change along a curve. On the demand curve, a movement denotes a change in both price and quantity demanded from one point to another on the curve. The movement implies that the demand relationship remains consistent. Therefore, a movement along the demand curve will occur when the price of the good changes and the quantity demanded changes in accordance to the original demand relationship. In other words, a movement occurs when a change in the quantity demanded is caused only by a change in price, and vice versa. Slide 27 of 17
28. 28. CHAPTER 2: DEMAND AND SUPPLYShift Vs Movement TOPIC Like a movement along the demand curve, a movement along the supply curve means that the supply relationship remains consistent. Therefore, a movement along the supply curve will occur when the price of the good changes and the quantity supplied changes in accordance to the original supply relationship. In other words, a movement occurs when a change in quantity supplied is caused only by a change in price, and vice versa Slide 28 of 17
29. 29. CHAPTER 2: DEMAND AND SUPPLYShift Vs Movement TOPIC 2. Shifts A shift in a demand or supply curve occurs when a goods quantity demanded or supplied changes even though price remains the same. For instance, if the price for a bottle of beer was \$2 and the quantity of beer demanded increased from Q1 to Q2, then there would be a shift in the demand for beer. Shifts in the demand curve imply that the original demand relationship has changed, meaning that quantity demand is affected by a factor other than price. A shift in the demand relationship would occur if, for instance, beer suddenly became the only type of alcohol available for consumption. Slide 29 of 17
30. 30. CHAPTER 2: DEMAND AND SUPPLY TOPIC Conversely, if the price for a bottle of beer was \$2 and the quantity supplied decreased from Q1 to Q2, then there would be a shift in the supply of beer. Like a shift in the demand curve, a shift in the supply curve implies that the original supply curve has changed, meaning that the quantity supplied is effected by a factor other than price. A shift in the supply curve would occur if, for instance, a natural disaster caused a mass shortage of hops; beer manufacturers would be forced to supply less beer for the same price. Slide 30 of 17
31. 31. CHAPTER 2: DEMAND AND SUPPLYExample: Supply and demand relationship TOPIC  Imagine that a special edition CD of your favorite band is released for \$20. Because the record companys previous analysis showed that consumers will not demand CDs at a price higher than \$20, only ten CDs were released because the opportunity cost is too high for suppliers to produce more. If, however, the ten CDs are demanded by 20 people, the price will subsequently rise because, according to the demand relationship, as demand increases, so does the price. Consequently, the rise in price should prompt more CDs to be supplied as the supply relationship shows that the higher the price, the higher the quantity supplied.  If, however, there are 30 CDs produced and demand is still at 20, the price will not be pushed up because the supply more than accommodates demand. In fact after the 20 consumers have been satisfied with their CD purchases, the price of the leftover CDs may drop as CD producers attempt to sell the remaining ten CDs. The lower price will then make the CD more available to people who had previously decided that the opportunity cost of buying the CD at \$20 was too high. Slide 31 of 17
32. 32. CHAPTER 2: DEMAND AND SUPPLYEquilibrium TOPIC  When supply and demand are equal (i.e. when the supply function and demand function intersect) the economy is said to be at equilibrium. At this point, the allocation of goods is at its most efficient because the amount of goods being supplied is exactly the same as the amount of goods being demanded. Thus, everyone (individuals, firms, or countries) is satisfied with the current economic condition. At the given price, suppliers are selling all the goods that they have produced and consumers are getting all the goods that they are demanding. Slide 32 of 17
33. 33. CHAPTER 2: DEMAND AND SUPPLYClass Task/Preparation/Activity TOPIC  Revise the following for next week Assignment 1 (Individual) 1) Law of demand 2) Law of supply 3) Demand curve 4) Supply curve 5) Increase in demand 6) Increase in supply 7) Shift vs. Movement 8) Equilibrium 9) Plotting graph 10) Analysis, based on all topic discuss. Type of questions: Multiple Choice, Fill in the blanks, Structure, Analysis. Tips: Read all today’s chapter. Slide 33 of 17
34. 34. CHAPTER 2: DEMAND AND SUPPLYReferences TOPIC Download directly from this link  http://www.4shared.com/file/rGrBUbXr/Baeb602_02.html  http://www.4shared.com/file/vV0RCkvD/Baeb602_02_Part2_.html If you have facebook, please go to my page, click on Slide 34 of 17
35. 35. CHAPTER 2: DEMAND AND SUPPLYExercise 2.5 – Individual TOPIC Answer all of the following: 1) Illustrate with a diagram what is demand? 2) Illustrate with a diagram what is supply? 3) Illustrate with a diagram what is equilibrium? 4) Plot the following within the same graph a) A = When the quantity of x is 10, it’s equal to \$20 b) B = When the quantity of x is 20, it’s equal to \$40 c) C = When the quantity of x is 30, it’s equal to \$60 Full name: Student ID/ Passport / IC: Subject code: BAEB602 Date: Please submit before you leave class. Slide 35 of 17