Secondary producer.
An industry that, in addition to producing its primary product, also produces other goods or services. These other goods or services are referred to as secondary products. Typically, the industry shares the same name as the primary product that it produces.

Special drawing rights (SDR).
Reserve assets created by the International Monetary Fund (IMF) and periodically allocated to IMF members in proportion to their respective quotas. The IMF determines the value of SDRs daily by summing, in U.S. dollars, the values–based on market exchange rates–of a weighted basket of currencies. SDRs can be used to acquire other members' currencies, to settle members' financial obligations, and to extend loans.
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Standard International Trade Classification (SITC).
An internationally recognized foreign trade data classification system. This system, which was developed by the United Nations, provides the commodity aggregates needed for economic analysis and permits international comparisons of foreign trade data.
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