The answer is <span>geography</span>
        
                    
             
        
        
        
Answer:
8. Barter Economy
Explanation:
Barter means exchange goods for services.
 
        
             
        
        
        
They do this because back then, a lot of things happened in ancient Greece. So because so many things happen, they have to carefully study the events and place them in a category or order in order to make sense.<span />
        
                    
             
        
        
        
George Marshall is that person.
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