A reason why a weak currency will not always improve a country’s balance of trade is that importers and exporters that are under the same ownership have unique relationships. Many firms purchase products that are produced by their subsidiaries in what is referred to as intracompany trade. This type of trade makes up more than 50 percent of all international trade. The trade between the two parties will normally continue regardless of exchange rate movements. Thus , the impact of exchange rate movements on intracompany trade patterns is limited.
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