In Chapter 4 of Nicholson and Snyder, there is a notion of the lump-sum principle: An income tax that collected the same amount of tax revenue as the excise tax on good x is superior to the excise tax. Graphically illustrate that the lump-sum principle also applies to subsidy, that is, income subsidy improves individual's utility more than a price subsidy on good x. (You need to show that the budget line after the income subsidy p