Based on Lucinda's marginal benefit when the Kewpie price is $8 per doll, a rational Lucinda would buy 4 dolls.
How many dolls would a rational person buy?
Lucinda would buy the same number of dolls that would equate their price to their marginal benefit to her.
If the price is $8 therefore, the number of dolls that corresponds to the marginal benefit of $8 is 4 dolls.
Lucinda would therefore buy 4 dolls.
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