John is appalled when he is charged $50 for a cake instead of its usual price of $25.When he is charged $50 instead of $40,he barely notices the difference.In the context of Weber's law,which of the following price increases for a cake would most likely be equally appalling to John?
A)$100 instead of $80
B)$100 instead of $50
C)$60 instead of $50
D)$60 instead of $80

Question

Quizplus · Accepted Answer

Weber's law states that the just noticeable difference (JND) between two stimuli is a constant proportion of the original stimulus. In this case, the JND is the difference between the original price and the price that John finds appalling. When the price is increased from $25 to $50, the JND is $25. When the price is increased from $40 to $50, the JND is $10. Therefore, the price increase that would be equally appalling to John is $100 - $50 = $50.

John Is Appalled When He Is Charged $50 for a Cake