Self-service, mail order and automatic vending are examples of

Self-service, mail order, and automatic vending are examples of selling techniques. Selling techniques refer to the various methods used by businesses to promote their products or services and persuade customers to buy them. Self-service refers to a selling technique in which the customer selects and purchases goods without the assistance of a salesperson. Mail order involves selling products through catalogs or advertisements that customers can order by mail. Automatic vending is a selling technique in which goods are sold through machines that dispense them when money is inserted. In summary, these techniques do not involve personal interaction between a salesperson and the customer, but instead rely on other methods to make sales.