B is vertical intercept of the compensated budget. This is the amount of good Y that could be purchased on the compensated budget if nothing else were bought, or the compensated income divided by the price of Y.
We compensate our consumer by the amount of X originally consumed (50) times the increase in price ($1) so compensation = $50. Thus, the compensated income = $80 + $50 = $130. Since Y sells for $2 per unit the vertical intercept is $130 ÷ $2/unit = 65 units.
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