Final answer:
In advertising, claiming to be the 'best' or 'most wonderful' product is known as puffery, which is legal as long as it doesn't involve false information. The FTC monitors such claims, and buyers are cautioned with 'caveat emptor', meaning 'let the buyer beware'.
Step-by-step explanation:
Claiming to be the 'best', 'greatest', 'most wonderful' product is indicative of an advertising style known as puffery. This style employs exaggerated or hyperbolic language to enhance the appeal of a product or service. While such claims enhance the image of a product, they are often subjective and not necessarily factual.
This is why the Federal Trade Commission (FTC) permits exaggerated or ambiguous language as long as it does not constitute false information. Hence, advertisers can legally claim their product is the 'most wonderful' without providing concrete evidence for it, operating within a space where caveat emptor - 'let the buyer beware' - still applies.