[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.
5. If the expected future price of the product rises (falls), the supply curve in the present period shifts leftward (rightward). A change in supply also affects the price and quantity of the product. 1. An increase in supply (a shift rightward of the supply curve) causes the price to fall and the quantity to increase. 2. A decrease in supply (a shift leftward in the supply curve) causes the price to rise and the quantity to decrease