Darth Vader employs the bounty hunters, additional workers, to find the Millennium Falcon and Han Solo since they are becoming a much bigger problem for him relative to what they once were. This is similar to when a firm needs to hire additional workers to produce the desired output. Even though Darth Vader is very much capable of finding Han himself, he has bigger responsibilities, such as running a Galactic Empire, that prevent him from doing so. Darth Vader hires employees who specialize in finding bounty hunters. Labor Specialization is when an individual, who is highly skilled in one area, specializes in that one particular job, and does only that job. Learn more about Specialization in this clip!