Buyers’ Commitment

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Studies indicate that potential buyers of an expensive product are more likely to go through with their purchase if they have first made a purchase of a related product, such as an inexpensive product sold by the same company in the same place. Psychologists attribute this behavior to commitment bias, in which people's present actions are influenced by a desire to act consistently with their past actions. A company that sells expensive products will increase sales of these items by first inducing customers to buy inexpensive, easy-to-sell items.

Which of the following, if true, most strongly supports the interpretation of the studies?