出版社：United States Department of Agriculture, Economic Research Service
摘要：Countries vary in their trade orientation because of underlying forces
affecting supply and demand, some of which are not very well understood.
Changing consumer preferences, geography, technology, and policies
affecting market access all contribute toward shaping patterns of food trade.
While recognizing that fundamental economic forces often change over time,
trade patterns can be examined by focusing on such characteristics as product
composition, trade balances, and product makeup of trading partners.
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