They are the men on our doorsteps perhaps even with a foot in our door -salesmen; earning a living by persuading us to pay for something we may not even have known we wanted. In exhibitions, market places, suburban streets, car show rooms, and 100-a-day hotel suites they practise their skills and take our money. But what is in it for them-apart from the commission? Why do people get more than just a living out of selling? And who are the top men, who may make a million pounds out of a single deal?