[Note: The distance between cities in California (US) distance chart below is straight line distance (may be called as flying or air distance) between the two locations in California (US) calculated based on their latitudes and longitudes. This distance may be very much different from the actual travel distance.]
In drawing the demand schedule or the demand curve for a good we take income of the people as given and constant. When as a result of the rise in the income of the people, the demand increases, the whole of the demand curve shifts upward and vice versa. The greater income means the greater purchasing power.
A consumers income can affect their demand for most goods, for  normal goods if the consumers income increases then there is a  demand for more normal good, but a fall in in â¦ come would cause a  shift to the left for the demand curve, this shift is called a  decrease in command.