Other Things Equal, Would the Formation of a Customs Union

Essay

Other things equal, would the formation of a customs union with many members be more likely or less likely to improve welfare for a given member country than the formation of a customs union with only a few members? Why or why not? Other things equal, would the formation of a customs union be more likely or less likely to enhance welfare for a given member country if that country had very high preunion tariffs than if it had very low preunion tariffs? Why or why not?