Demand and the determinants of demand

The figure presents a graph of two demand curves in the first quadrant of the cartesian plane. The horizontal axis is labeled Q and the vertical axis is labeled P. One curve is labeled D 1 and starts at the vertical axis above the origin at coordinates 9 and 0 and moves downward and to the right and ends at coordinates 3 and 0. The second curve is labeled D 2 and is directly below and parallel to the first curve and starts at coordinates 0 and 6 and moves down and to the right and ends at coordinates 2 and 0. There is an arrow pointing from the first curve to the second curve.