Final answer:
The person or agency responsible for creating the Maypo cereal ad that increased sales by 78% is not specified in the given references. Advertising strategies and their success are discussed with examples such as Wonder Bread and Kellogg's Corn Flakes, highlighting the power of marketing in influencing consumer behavior.
Step-by-step explanation:
The creator of the successful Maypo cereal advertisement, which led to a 78% increase in sales, isn't directly mentioned in the provided references. However, advertising tactics and their impact on consumer behavior is a well-documented phenomenon within the realm of business and marketing. A reference is given to the effectiveness of television advertisements in the case of Wonder Bread, which saw objection from the FTC due to claims about extra calcium improving cognitive functions. This parallels the topic of influential advertising but does not directly answer the question.
On a broader scope, companies have long utilized persuasive marketing strategies to impact sales, as seen with the emergence of mail-order houses like Sears and the widespread influence of consumer products such as Kellogg's Corn Flakes stemming from savvy advertising. These examples culminate in the understanding that a well-crafted advertisement, such as the one for Maypo cereal, can have a significant effect on product sales.