Crissen Murphy of Rockford, Illinois, is among those working two jobs. The 29-year-old works full time as a sales representative for Hinckley Springs, a water delivery service company, while also operating his own mobile car wash and detailing business, called Murphy's Portable Wash.
"I just do it on the weekends for extra money to help pay bills," Murphy told CBS MoneyWatch.
Read more: More American workers are taking on second jobs as inflation rages