Because of the many forms and used of advertisement, it is hard to generalize about its unique qualities as a part of the promotion mix. Yet several qualities can be noted. Advertisement's public nature suggests that the advertised product is standard and legitimate. Because many people see ads for the product, buyers know that purchasing the product will be publicly understood and accepted. Advertisement also lets the seller repeat a message many times, and it lets the buyer receive and compare the messages of various competitors. Large scale advertisement by a seller says something positive about the seller's size, popularity, and success.