As usual, we will be interested in the marginal benefit. As we did in the main text of this chapter, we can define the marginal benefit in parallel as we did the marginal utility:
That is, as near as we can approximate, the marginal benefit is the additional benefit from increasing consumption by one unit. For example, using the table in the previous overhead, when consumption of burgers is increased from 2 burgers to 4, we have 
total benefit = 18-15 = 3 and burgers = 4-2 = 2, so the marginal benefit for the range of 2 to 4 burgers is 3/2=1.5.
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