Why did the advertising industry increase during the 1920s?

The advertising industry surged in the 1920s due to the post-World War I economic boom, which led to increased consumer spending and the rise of mass production. Innovations in technology, such as radio and print media, provided new platforms for reaching a broader audience. Additionally, the cultural shift towards consumerism and the desire for modernity encouraged businesses to invest in advertising to differentiate their products and attract consumers. This era marked the beginning of modern advertising techniques, focusing on branding and emotional appeal.