Jerry recently graduates with an MBA degree from a leading university and will be going to work as an employee of a major stock brokerage firm. Jerry is unsure of the circumstances under which he can legitimately deduct the costs of entertaining and dining with clients and prospective clients. Jerry will spend approximately $5,000 a year on such activities for which he will not be reimbursed. It is important that he be able to derive tax benefit for these costs. Advise jerry of the general rules in this area of the tax law. Include a brief discussion of substantiation requirements for such business expenses.