Like Father, Like Son

Rebbe Yochanan says that a person should not deviate from his own trade or the trade of his fathers (Arachin 16b). The Gemara often offers Torah-based advice regarding how one should conduct himself in his affairs. Is this one such example of business advice? Further, Rebbe Yochanan doesn’t offer any explanation for his statement. What are the reasons one should not give up his profession?
The Ben Yehoyada explains that there are three distinct rationales for Rebbe Yochanan’s dictum. The first is that after many years in business, a person has likely developed a steady stream of loyal customers. A son taking over his father’s business could tap into these customers. Hopefully, these customers will show him the same loyalty they showed to his father. When making a decision to start a new profession, this factor must be taken into account.
The second reason offered is that people generally become comfortable with a trade that they have practiced for a while. The same can be true of a trade that was practiced by one’s father. Even if a new opportunity arises, one must understand that although he may be capable of performing admirably in the new profession, he may suffer from the fact that his “heart and soul” are not into it.