Mishna in Pirkey Avos 2::2 basically says that a person should learn and work together. Explanation brought by artscroll mentions that a person who only learns without working will come to do an avera. For example money from support will not be enough and then he’ll be desperate to find a job that pays enough to cover all the bills and will be forced to steal (or work dishonestly).
Generally, I think not enough people are learning halachas of business before going into the business world and then fall into temptations.