WHEN IT COMES to the funds of American shoppers, the viral movies produced by Caleb Hammer, a personal-finance social-media star, present some trigger for concern. His “monetary audits” of debt-laden company have amassed nearly 2m followers on TikTok and YouTube in lower than three years. Mr Hammer’s interviewees—sometimes younger and silly—scramble to justify their wild borrowing habits, to their interviewer’s rising ire.
