Okay, let’s break it down. Marcia has skills in Supply Chain Management, Retail, and Strategic Planning, which are valuable in various industries. Her experience as a Supervisor at SPAR Group, a well-known company, indicates she has hands-on experience. However, the industry and location are not specified. According to national averages in the United States, a Supervisor with similar skills can earn around $40-$70 per hour. Considering the skills and experience, I'll estimate around $60 per hour, which is on the lower end of the range. This is because the industry and location are not provided, which could impact the actual rate.