New York City restaurant workers sing and dance to the tune of "Money" in a new video aimed at increasing the minimum wage and bringing attention to this sector of the workforce.

I found Michael Saltzman's article enlightening ("Labor secretary's coming war on jobs," July 23). However, what he didn't say is what percentage of wage earners are not teenagers; those who are adults, perhaps even trying to support a family? What does research say about the kind of jobs in which older workers are employed, and what kind of impact would raising the minimum wage have on their job opportunities?

As I have thought about this debate over the years, I have wondered if a minimum wage law could be written to allow for two tiers. Teenagers could be employed for a lesser minimum wage, while older wage earners could benefit from a higher minimum wage.

Larry Tippetts