Mixed economies . have characteristics of both command and market economic systems
alternate between command and market economic systems every two years
only exist in the Eastern hemisphere
are the most efficient economic systems

In 1819, what did the united states obtain from spain for $5 million?

Explain how scientist from the scientific revolution and the catholic church tie together

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.