Eco is one of the relatively successful regional trade associations of
Which Iran has been an active member since its formation. After the
collapse of the Soviet Union, a group of new independent Moslem states,
together with Afghanistan, Joined ECO. Due to the fact that Russian and
Chinese economies seem to. Complement those of ECO members, this
study examines the effects of the said countries joining, ECO.
Based on econometric results using the gravity model, in the first model
in which the common border among countries under study is not considered,
with Russia joining ECO, the volume of trade among the countries under
study is greater than the Original situation, and the situation of China
membership. In the second model, in which common border is considered,
the amount of trade is greatest when China joins the group.