make densely populated areas easy to walk
 
        
                    
             
        
        
        
Answer:
New York City is a major center of commerce and trade after the Erie Canal was built in the early 1800's.
Explanation:
 
        
                    
             
        
        
        
Answer: Self-esteem
Explanation:
Self-esteem is a person's overall personal value. This defines the answer to the question.
 
        
             
        
        
        
Answer: Option(c) is correct 
Explanation:
Economic model is the concept that depict the real economic behavior and processes through hypothetical construction.It helps in understanding the complex concept of economic procedures with ease,simplicity and logically.It helps in testing theories and representing relationships.
Other options are incorrect because economic model not increase complexity in understanding concept, can be proven incorrect,does not includes critical elements and equation usage is not done in normative concept. Thus, the correct option is option(c).
 
        
             
        
        
        
Article II of the Constitution establishes the Executive branch of the federal government. It defines the office of President and Vice President, and an Electoral College to elect them.