The Psychology of Salesmanship

But a change has come to the man in business. [...] In fact, if he has thought sufficiently on the subject, he will have seen that the entire process of selling goods, personally, or by means of advertising or display, is essentially a mental process depending upon the state of mind induced in the purchaser, and that these states of mind are induced solely by reason of certain established principles of psychology. Whether the salesman, or advertiser, realizes this or not, he is employing psychological principles in attracting the attention, arousing the interest, creating the desire, and moving the will of the purchaser of his goods.