Which protection mechanism has been used since 1969 to protect the U.S. steel industry?

Question

Quizplus · Accepted Answer

Voluntary export restraints are self-imposed quotas and constitute a barrier to trade. The U.S. used voluntary export restraints to protect local steel industries. A country that is subject to voluntary export restraints limits the quantity of product it exports to another, primarily because it attempts, by doing so, to avoid more severe future mandatory import restrictions.

Which Protection Mechanism Has Been Used Since 1969 to Protect