How advertising affects the economic development of a country in various ways is explained here. Advertising may shift the demand curve for a class of products. It also brings about product differentiation between various brands of a product and helps in improving the quality of a product by inducing the producers or sellers to maintain the quality of goods/services sold under their brands. With the wide range of products available, advertising serves as a guide to consumption. It also helps the growth of a country's national income by influencing investment and technological advance.