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). 
        
             
        
        
        
Answer:
Centered on economics, the one that will be more important in decision-making is: capital worth The money value relates to one's willingness to invest one's capital on having what they want. A low-resource organization that seems to be more selective on how they spend their resource Hope that helps. If you need more support, let me know!
 
        
                    
             
        
        
        
Answer:
Southern Africa I believe 
 
        
                    
             
        
        
        
Answer:
they were seperated from enemies
Explanation:
they were safer than most places