Decreases in Quantity Demanded:
When consumption of a commodity reduces as a result of a rise in the own price of the commodity it is described as decrease in quantity demanded. It is shown as an upward movement along the same demand curve.
Figure: Decrease in Quantity Demanded
From Figure when the price of the commodity was c3,000 quantity demanded was 80 bags, and , when price rose to c4,000 consumption reduced to 60 bags.