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Basic Economic

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SECTION A 1. A change in demand refers to a decrease or increase in demand due to change in non-price factors affecting demand. Therefore, it is referred to as a shift in demand (Forstater and Mathew 57). For instance, tea and coffee are close substitutes, if there is a decline in the price of a substitute (coffee); demand for the other good (tea) will decline as indicated in the graph below. D0 indicate the initial demand curve for tea, however, after a decline in the price of coffee, the demand curve shift to D1. D0 P D1

Quantity Conversely, a change in quantity demanded occurs as a response by consumers to a change in a commodity price. It is referred to as a movement along a demand curve (Frank, Ben and Louis 76). In the graph below, the initial price is P0 and the corresponding quantity demanded is Q0, however, when the price changes to P1, quantity demanded also changes to Q1. This represents a change in quantity demanded from Q0 to Q1.

P D0 P1 B

P0 A D0

Q1 Q0 Quantity
A change in quantity supplied is caused by a change in the price of the commodity itself. It is referred to as a movement along a supply curve. Initially the price of a commodity is P1 but a fall in price to P2 leads to a fall in the amount of quantity demanded from Q1 to Q2. This represents a change in quantity supplied.
P
P1 A

P2 B

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