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Advantages of Magazines: Services 

A final advantage of magazines is the special services some publications offer advertisers. Some magazines have merchandising staffs that call on trade intermediaries like retailers to let them know a product is being advertised in their publication and to encourage them to display or promote the item. Another service offered by magazines (usually the larger ones) is research studies that they conduct on consumers. These may include consumer trends, changing purchase patterns, and media usage or may be relevant to a specific product.

http://www.topdesignmag.com/40-examples-of-clever-print-ads/