In ads for rock music concerts,concert promoters usually hide the cost of tickets from fans.According to your text,this should

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Hiding the cost of tickets and requiring potential buyers to call for the price can increase sales because it involves a personal commitment. Once fans make the effort to call and inquire about the price, they are more likely to follow through with a purchase due to the commitment they've already made. This principle is based on the idea that small commitments can lead to larger commitments, a concept often utilized in marketing and persuasion strategies.

In Ads for Rock Music Concerts,concert Promoters Usually Hide the Cost