List the three U.S. comparative advantages and briefly discuss the implications of each

    1.  Technology advantage:  

    2. Large domestic market: 

    3. Large area in temperate zone  

List the three U.S. comparative disadvantages and briefly discuss the implications of each

     1. High wages:

    2. Lack of basic materials 

    3. Limited zone: 

Briefly describe the basic nature and impact of geographic  mobility in the U. S.