This type of selling has started in India in recent years. This type of selling operates through detailed color catalogues providing pictorial designs and shades in which an item is available. They bear code numbers and price per each unit. Orders are sent through price plus postages pre paid by post. However this system has disadvantage that the product cannot be seen or tried before the final purchase. More over the instruction given on the products can be followed only by literate consumers who can benefit from such sources
Black marketing:
This form of selling exists through deliberate creation of strength of products in the market. Strategies are created through hoarding. Sellers offer goods in small quantities at exorbitant prices. For example, Cinema Tickets are sold in black market. This practice is illegal. However such black marketing is found in certain cases. Consumers have to become aware of such illegal practices through consumer movement.