Instructions Assumption: Countries A, B, and C are members of a particular form of economic integration: a. Custom Union: Country B and C's involvement to A's trade relationship with country X. Assuming that country X is not a member country b. Common Market: Country B and C's involvement to A's trade relationship with country X. Assuming that country X is not a member country. c. What separates the following? 1) common market from custom union 2) custom union from free trade area