In the book "Perennial Seller," Ryan Holiday emphasizes the importance of purpose in product creation. He argues that any successful product must answer critical questions about its value and relevance in the world. The underlying message is that products should not only serve a function but also enhance the lives of consumers in meaningful ways.

Holiday stresses that a product's ability to improve people's lives is a key factor in its longevity and success in the market. By focusing on creating something that resonates with buyers and fulfills a genuine need, creators can ensure that their work remains significant over time, transcending fleeting trends and superficial demands.