Railroad, barbed wire and the modern water pump
it was a sandinist on Nicaragua
Answer:
Social classes and urbanization would be the answer to this question.
Answer: Servant Leadership
Explanation: The service leader shares power, puts the needs of others first, and helps people develop and perform their jobs as well as possible. Service leadership reverses the pyramid of power; Instead of people working to serve the leader, the leader exists to serve others. When leaders shift to this paradigm of serving first, leaders achieve a purpose and creativity in those around them, resulting in better performing, more motivated and more satisfied people.
This is an example of exchange theory.
In sociology, exchange theory has to do with maximizing benefits while also minimizing costs. When applied to Bill and Cathy's situation, they are taking advantage of each other's skills in order to minimize costs - Bill can cook and Cathy can't (so they can prepare food on their own) and Cathy can repair stuff and Bill can't (so they don't have to get a handyman).