The consumer surplus of Alexis, Bruno and Camila is equal to $8.
Consumer surplus is the difference between the price of an item and the willingness to pay of the consumer. A rational consumer would purchase an item if the consumer surplus is positive.
Consumer surplus = willingness to pay - price of the item
Alexis' consumer surplus = $12 - $6 = $6
Bruno's consumer surplus = $8 - $6 = $2
Total surplus - $6 + $2 = $8
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