Research contained in the book, "Tough Calls" gives insight in dealing with problem clients.Press Releases from Tough Calls:-National Average: One out of every six clients in America is a problem client-Almost one third of all job related stress for salespeople comes from dealing with problem clients-Client insecurity is the motivation for most problem client behavior-Problem clients who affect you on a more personal level-Women and men find different problem clients stressful-The most common problem client, by far, is the client who grinds you on price-The most stressful client to deal with is the client who complains about everything-When selling the Fortune 500 expect more problem customers-The percentage of your clients who are problem clients depends on what you sell-The kinds of problem clients whom you encounter also vary according to what you sell-The percentage of your clients who are problem clients depends on your selling style-People who sell mainly to Fortune 500 corporations encounter about twice the number of problem clients as people who do not-Problem Clients Job-Related Stress by Years Selling-More than one fourth of the time a sales manager-Problem clients can be good for business