Final answer:
The FTC is likely to start an investigation into the advertiser to determine if the claim 'the best that money can buy' is false or misleading.
Step-by-step explanation:
When an advertisement claims to be 'the best that money can buy,' the most likely action the Federal Trade Commission (FTC) will take is to initiate an investigation into the advertiser. The FTC checks factual claims about a product's performance to ensure they are true. Although certain exaggerations and ambiguous statements are permitted in advertising, presenting false facts is not allowed. An FTC investigation would determine whether the advertisement contains any false, misleading, or unsubstantiated claims that could potentially harm consumers. In scenarios where an ad's claims are found to be false, the FTC may issue a warning, impose a fine, or even sue the advertiser depending on the severity of the infraction.