Often when you're sitting in a Waffle House, the jukebox will periodically play a tune even though no one has been near the machine. It is hoped that hearing this music will encourage patrons at the restaurant to actually buy more music. This is an example of:

Question

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This is an example of sampling, where a taste or experience of a product (in this case, music) is given away for free in the hope that consumers will enjoy it and decide to purchase more.

Often When You're Sitting in a Waffle House, the Jukebox