Politically, a country’s government may seek to protect jobs or specific industries. Some industries may be considered essential for national security purposes, such as defense, telecommunications, and infrastructure—for example, a government may be concerned about who owns the ports within its country. National security issues can impact both the import and exports of a country, as some governments may not want advanced technological information to be sold to unfriendly foreign interests. Some governments use trade as a retaliatory measure if another country is politically or economically unfair. On the other hand, governments may influence trade to reward a country for political support on global matters.