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ECON 160 Week 4

ECON 160 Week 4. The functioning of Markets: The interaction of buyers and sellers. (Chapter 4). Review. Economic competition : We compete for goods by offering to trade $ dollars. Circular flow diagram : Shows the interaction of households and firms in two kinds of markets.

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ECON 160 Week 4

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  1. ECON 160Week 4 • The functioning of Markets: The interaction of buyers and sellers. (Chapter 4)

  2. Review • Economic competition: We compete for goods by offering to trade $ dollars. • Circular flow diagram: Shows the interaction of households and firms in two kinds of markets.

  3. Circular Flow Diagram of the Exchange Economy Goods & Services Goods & Services Product Markets $'s $'s Revenue HOUSEHOLDS FIRMS $'s $'s Income Inputs Resources Resource Markets

  4. NEW: Study of Markets • Markets are the interaction of buyers and sellers. • Some markets are local, some worldwide. • Focus on buyers and sellers separately: Separate graphs for each group. • Ceteris paribus: look at one thing at a time; All other things held equal.

  5. Marginal Value • Focusing on a buyer, we measure the personal marginal value of a good as the most $’s you are willing to give up to acquire an additional unit. (How much you are willing to trade) • Graph the marginal value as a height above each additional unit per time period.

  6. Marginal Value Declines • Plot the marginal value as a height above additional units. • As you have more of any good, the marginal value declines.

  7. Marginal Value = The Most you are willing to pay for each additional unit

  8. Marginal Value MVx $ 10 $ 9 $ 8 $ 7 $ 6 $ 5 $ 4 $ 3 $ 2 $ 1 Marginal Value The height above each additional unit = the most you are willing to pay Qtyx/T 1 2 3 4 5 6 7 8 9 10

  9. How much are you willing to Buy? • By comparing the marginal value with the $ Price at which the good is available, we can read the quantity you are willing to buy at each $ price. (horizontal distance) • Demand: A schedule of the alternative quantities that an individual is willing and able to buy at alternative $ prices.

  10. Demand Curve $Price x $ 10 $ 9 $ 8$ 7 $ 6 $ 5 $ 4 $ 3 $ 2 $ 1 MVx = Demand X Qtyx/T 1 2 3 4 5 6 7 8 9 10

  11. Demand for X $ P x $ 10 $ 9 $ 8 $ 7 $ 6 $ 5 $ 4 $ 3 $ 2 $ 1 Dx Demand shows the amounts purchased at alternative prices(horizontal distances at each price) Demand x Dx Qtyx /T 1 2 3 4 5 6 7 8 9 10

  12. First Law of Demand • The higher the price of a good, the smaller the quantity demanded; the lower the price of a good, the greater the quantity demanded. • Demand is downward sloping. • A change in price leads to a change in quantity demanded = a movement along the function

  13. Change in Price Vrs. Change in Demand • A change in price is a move on the demand schedule. • A change in demand is a shift of the function due to something else changing.

  14. Increase in Demand $ P x $ 10 $ 9 $ 8 $ 7 $ 6 $ 5 $ 4 $ 3 $ 2 $ 1 Dx’ Increase in demand is a rightward shift (greater quantity demanded at each price.) Dx Dx’ Dx Qtyx /T 1 2 3 4 5 6 7 8 9 10 11 12

  15. Determinants of Demand • What factors determine the position of demand ? • What changes in other factors will cause demand to increase (shift right) or decrease (shift left)?

  16. Determinants of Demand: (Shift Factors) • Taste & preference: how much you like the good. If T&P increase, demand increases. (Rightward shift). • Income: a change in income affects demand. • Normal good: increase in income increases demand. (Right Shift) • Inferior good: increase in income decreases demand. (Left Shift)

  17. Determinants of Demand, Continued • Price of other goods: • Substitutes: most other goods are substitutes; An increase in the price of a substitute increases demand (rightward shift). • Complements: Goods used together; an increase in the price of complements decreases demand (leftward shift).

  18. Determinants of Demand, Continued • Future Price Expectations: an increase in the expected future price will increase demand today.

  19. Market Demand • The market demand is the sum of the individual demands of the buyers. • An increase in the number of buyers will increase market demand.

  20. Market Supply • Supply is a schedule of the alternative quantities which sellers are willing and able to sell at alternative prices.

  21. Market Supply • Supply is a schedule of the alternative quantities which sellers are willing and able to sell at alternative prices. • Supply is generally a positive relationship: at higher prices the quantity supplied is larger.

  22. Supply Curve $Price $10 8 6 4 2 2 4 6 8 10 12 14 16 Qty x/ T

  23. The Height of the Supply Curve is based on Marginal Cost of Production $Price $10 8 6 4 2 2 4 6 8 10 12 14 16 Qty x/ T

  24. Change in Quantity Vrs Shift in Supply • If sellers can get a higher price, the increase in quantity supplied is a movement on the supply curve. • If some other factor changes, the supply curve will shift. • An increase in supply is a rightward shift. • A decrease in supply is a leftward shift.

  25. Determinants of Supply: (Shift Factors) • 1. Price of inputs: an increase in price of inputs will decrease supply (leftward shift). • 2. Value of Alternative Outputs: As the value of alternative outputs increases, supply decreases. • 3. Change in technology: an increase in technology will increase supply (rightward shift). • 4. Number of sellers: as more sellers enter a market the supply shifts rightward.

  26. The Market $Price $ 4 3 2.50 2.00 1.50 1.00 .50 .25 Demand Surplus at this $ Price Supply 100 200 300 400 500 600 700 800 900 1000 1100 Q x/ T

  27. $Price The Market $ 4 3 2.50 2.00 1.50 1.00 .50 .25 Demand Supply Shortage at this $ Price 100 200 300 400 500 600 700 800 900 1000 1100 Q x/ T

  28. $Price Market Equilibrium Dx = Sx at Pe 4 3 2.50 2.00 1.50 Pe 1.00 .50 .25 Demand Supply 100 200 300 400 500 600 700 800 900 1000 1100 Q x/ T Qe

  29. Market: Demand & Supply $ P x Demand $ 10 $ 9 $ 8 $ 7 $ 6 $ 5 $ 4 $ 3 $ 2 $ 1 Supply At the equilibrium Price, the Dx = Sx Pe Sx Dx Qtyx /T 1 2 3 4 5 6 7 8 9 10 11 12 Qe

  30. Effects of Increase in Demand on Price and Quantity $ P x D1 Do $ 10 $ 9 $ 8 $ 7 $ 6 $ 5 $ 4 $ 3 $ 2 $ 1 Supply Increases Price and Quantity Pe D1 Sx Do Qtyx /T 1 2 3 4 5 6 7 8 9 10 11 12 Qe

  31. Demand Determines Price $ P x D3 $ 10 $ 9 $ 8 $ 7 $ 6 $ 5 $ 4 $ 3 $ 2 $ 1 Supply: Response D2 Demand pulls forth output D1 D3 Sx D2 D1 Qtyx /T 1 2 3 4 5 6 7 8 9 10 11 12

  32. Effects of an Increase in Supply on Price and Quantity $ P x S0 Demand $ 10 $ 9 $ 8 $ 7 $ 6 $ 5 $ 4 $ 3 $ 2 $ 1 S1 Pe Price decreases and Quantity increases S0 Dx S1 Qtyx /T 1 2 3 4 5 6 7 8 9 10 11 12 Qe

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