Final answer:
Radio has simplified advertisement by passively reaching a wide audience through broadcasts that intersperse ads with entertainment, an approach which doesn't require the audience's active participation. Advertising costs are included in the product prices purchased by the consumers. Developments like satellite radio subscriptions also represent an evolution in how radio interacts with advertising.
Step-by-step explanation:
Radio has made advertisement easier primarily in the sense that it allows advertisers to reach out to a broad audience without requiring the active participation of consumers. Upon turning on the dial, an ad can start to play, which means that it's a passive form of advertising where the audience doesn't need to do anything to receive the message. This contrasts with print ads, where a reader must actively look at the advertisement. Furthermore, radio advertising is built into the product cost, so essentially, consumers indirectly pay for the radio service when they purchase advertised goods.
Another aspect of how radio has changed the advertisement landscape is its ability to intersperse ads into entertainment such as news, stories, and sports without much effort from the listener. Given its wide reach, radio ads need to be crafted carefully to avoid offending a diverse audience, which is a different challenge compared to more targeted print ads.
Moreover, radio advertising represents an indirect way of 'charging' listeners by taking up some of their time. Listeners are exposed to ads that are incorporated into the cost of the products advertised. Other developments like satellite radio services such as SiriusXM offer a subscription-based model without commercials, demonstrating another evolution in radio broadcasting and advertisement.