Primary demand is the demand for the product category. Thus option 4th is correct.
Demand refers to the desire and the ability to purchase a product. The demand of the product is generated because of the need for the product which is begged by the purchasing power of the individual.
Primary demand is the desire for a specific product kind or category as opposed to a specific brand. Without emphasizing the benefits of using products from a certain company, it concentrates on the advantages of a product.
Thus option 4th is correct.
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