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Summary of Supply and Demand

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DEMAND AND SUPPLY

The Individual Demand Curve and the Law of Demand

1. The individual demand curve shows the relationship between the price of the good and the quantity that a consumer is willing to buy during a particular time period, holding all other variables constant. To construct a demand curve, we use the data shown in a demand schedule which contains, for each price, the quantity that a consumer is willing to buy. 2. The law of demand states that the lower the price, the higher the quantity demanded, ceteris paribus. Thus the demand curve is negatively sloped because of: a. Substitution effect: A fall in the price of the good lowers the opportunity cost of consuming it (the number of other goods you must give up), and thus consumers are likely to substitute this good for others. b. Income effect: A fall in the price means that a given amount of money will buy more of all goods; in other words, real income has increased. The consumer is likely to purchase more of this good and of other goods. 3. A change in quantity demanded refers to a movement along the demand curve and is caused ONLY by a change in price.

From Individual to Market Demand

1. The market demand curve shows the relationship between the price of the good and quantity that all consumers together are willing to buy.
2. In addition to the number of buyers (population), factors other than the price of the good that determine individual demand are held constant along the demand curve. These non-price variables include a. Consumer income. b. The price of related goods. i. complements ii. substitutes c. Consumer tastes/preferences and advertising. d. Consumer expectations about future prices
3. These non-price factors cause the demand curve to move (shift) to the right or left.

4. The market demand curve is

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