Infоrmаtiоn fоr questions 10-13 The world is mаde of five countries, A, B, C, D аnd E. There are no transportation costs among these countries, just (possibly) tariffs. Countries A and B are considering forming a Regional Trade Agreement (RTA). If they do so, then they will have no tariffs against each other’s goods, but will keep their tariffs against countries C, D, and E. The following table lists the costs of production per barrel of oil in the five countries. Also shown are country A’s tariffs imposed on imports of oil from other countries, before and after any RTA is formed. Cost of production ($/barrel of oil) A’s tariff ($/barrel of oil) before RTA A’s tariff ($/barrel of oil) after RTA Country A 52.50 -- -- Country B 36.00 5.50 0 Country C 30.50 5.50 5.50 Country D 31.10 4.90 4.90 Country E 35.30 4.90 4.90 After forming an RTA with country B, in order to conform with the “most favored nation” rule, country A should lower its tariffs on imports from: