Trade dependence is a measure of the importance of international trade in the overall economy. It can give an indication of the degree to which an economy is open to trade. Openness of an economy is determined by a large number of factors, most importantly by trade restrictions like tariffs, non-tariff barriers, foreign exchange regimes, non-trade policies and the structure of national economies. The share of trade transactions in a country’s value added is a result of all these factors. It’s possible that an open and liberalized economy has a relatively small TDI, if a large proportion of its GDP is create by non-traded activities supported by domestic market. Low trade dependence may indicate high trade restrictions either in that country or toward that country in overseas markets, or both.