What were peasants forced to mix in with their bread due to poor harvests?

Identify one specific example of how the enlightenment characterized a change in economic thought from the past

Clouds thar look like whisps of hair are

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.