Final answer:
The concept of 'let the buyer beware' implies a customer's responsibility to verify product claims, in line with the FTC's role in checking advertising facts.
Step-by-step explanation:
The question about allowing the customer to make a local call to verify appropriateness or preference relates to the concept of caveat emptor, which means 'let the buyer beware'. In the context of advertising and marketing, the Federal Trade Commission (FTC) plays a role in checking the factual claims about a product's performance, which suggests that customers should also be vigilant and perform their own verifications. While exaggerated or ambiguous language in advertising is allowed as long as it's not false, unsubstantiated facts are not permitted. The responsibility often falls on the consumer to verify the information and ensure that it meets their preferences or needs.