Fill in the blanks to make the following statements correct.

a. A regional trade agreement, such as the NAFTA, or a common market, such as the European Union, allows for ___________ , whereby trade within the group of member countries is increased.

b. A regional trade agreement, such as the NAFTA, or a common market, such as the European Union, also results in __________ whereby trade within the group of member countries replaces trade previously done with other __________.

c. The fundamental principle that guides the NAFTA is the principle of ________ , which means that any member country can implement the policies of its choosing, as long as ______ and ________ firms are treated equally.