"Suppose Lord & Thomas could multiply your sales. That would be very good for you, and it would be multiply our volume of business with you, because you would spend more money. We will write a new kind of copy for you, but you must pay us fifteen per cent commission on all ads that contain the new copy. If at the end of ninety days the results haven't increased, we'll give you back the money, and your account will still be on a ten percent basis. But as an earnest that you are interested, you will have to pay me a fee of $500" (Lasker, "Personal Reminiscences," p.78).