Answer following three questions (80 to 82) from information given in Diagram 1
[Diagram 1: A consumer's indifference-curve diagram with Good X on the vertical axis and Good Y on the horizontal axis. Initial equilibrium is at point A where indifference curve I1 is tangent to budget line BC1. The price of commodity Y falls, so the budget line pivots out to BC2 and the new equilibrium is at point C on the higher indifference curve I2. A dashed compensated budget line parallel to BC2 is tangent to I1 at point B. Quantities of Good Y are marked Y1 at A, Y2 at C and Ys at B; quantities of Good X are marked X1 at A, X2 at C and Xs at B.]
In Diagram 1, the movement of the consumer from point A to point B is due to
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