The number of dolls that Lucinda would buy if she is rational would be 4 dolls and this is because she can afford to buy up to six dolls
What is Marginal Benefit?
This refers to the additional benefit arising from a unit increase in a particular activity.
Hence, we can see that the given table is given below:
Kewpie Dolls Marginal Benefit (dollars)
1 $15.00
2 12.00
3 9.00
4 6.00
5 3.00
6 0.00
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