The social structure of Europe was challenged by the growing number of free towns people and its changing economy because of the fact that the political and social systems were not keeping up with the economic changes. The political, social and economic aspects of a country must be balanced and checked properly to ensure that each of the sectors are clearly and quickly adapts with the changes that any of the sectors within are imposing or experiencing. This is done in order to maintain the coordination and unity of all the sectors in the country.
A Mixed Economy is one where there is a mix of private and public enterprises present. Since the question indicated that there are private enterprises as well as public transportation and electricity, this is an example of a mixed economy.
I'd say either railroads or wagon trains because airplanes and steamboats are not land travel and wagon trains are a vehicle and railroads are a thing they ride on to guide them
