The Boss' Son (1978)

Bobby Rose has just returned home after graduating business school. He agrees to start working for his father, a successful carpet manufacturer. Bobby's dreams of a cushy junior exec position are quashed when he's told to report to the shipping department, where he's trained as a delivery driver. Learning the business from the ground up embitters Bobby, as well as his coworkers, some of whom, he discovers, are stealing from the company.