Smith stated in his theory that  the free market economy is Governed by "Invisible hand"
This stands in opposite argument of the free market economy which stated that the free market is governed by supply and demand
hope this helps
        
                    
             
        
        
        
Answer:It is because of his ethnocentrism
Explanation:
Ethnocentrism is a term that refers to the fact that someone thinks that their Culture,ethnicity,nationality,religion and race is better than that of other people .
This belief may make someone thinks that people need to convert into his or her religion or they need to start doing things that his or her nation does because the person believes that theirs(culture,nation, religion etc) is the only thing that is the best in the world.
Nathan says the American education is the only best and effective in the world and this probably offended these other students who come from other countries.
 
        
             
        
        
        
The answer is the paranoid personality disorder. This disorder is characterized by having tendencies to decipher other individual's actions as malicious, harmful and threatening. People suffering from this disorder are suspicious and have significant inability to give their trust to people around them.