Firms produce a homogeneous product which is a reason why individual firms under pure competition would not find it gainful to advertise their product.
Homogenous products are those that are perfect substitutes for one another and buyers comprehend no actual or real distinctions between the products offered by various firms. The single most significant dimension across which firms generating similar products compete is price.
Firms make the same goods and/or services in a perfect competition, so consumers buy the same thing despite of which provider they purchase it from.
Advertising would be pointless due to the lack of renewed interest in a product that everyone already makes. Instead, the advertisement may even profit competitors because the advantages of the advertised products will also implement competitive products, so customers may choose those instead.
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