Final answer:
For a producer to call a product "new," it must be entirely new or substantially changed in a significant, functional way as per the FTC guidelines.
Step-by-step explanation:
According to the Federal Trade Commission (FTC), for a producer to label a product as "new," the product must be entirely new or changed in a functionally significant or substantial respect. The FTC ensures that the factual claims about a product's performance made in advertisements are truthful. Exaggerated or ambiguous language is permissible as long as it's not factually false.
Ensuring the validity of advertisements aligns with the principle of caveat emptor, meaning "let the buyer beware." The definition of what constitutes a "new" drug is even more specific, including changes in manufacturer, excipients, purpose, or any substantial alteration.