When you answer the doorbell, you encounter a young person who hands you a free laminated bookmark and then asks whether you would be interested in subscribing to some magazines. This person is using the sales technique based on

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This person is using the reciprocity norm, a social norm where if someone does something for you, you feel a pressure or obligation to return the favor. By giving you a free bookmark, they are hoping you'll feel compelled to reciprocate by subscribing to the magazines.  The reciprocity norm dictates that if someone does something for us, we feel obliged to do something for him or her as well. If we accept the bookmark, we may subscribe to a magazine in return.

When You Answer the Doorbell, You Encounter a Young Person