Which of these is NOT one of the three major trade barriers?

When a country or individual focuses on producing the one thing they are best at we call this what

Which trade barrier places a tax on imported goods?

Which trade barrier places a total ban on trade with a certain country?

Which trade barrier places a limit on the amount of imported goods a country can receive?

What is scarcity?

Which of the following encourages international trade between countries?

Which trade barrier to governments use to increase the consumption of domestic goods and services?

Which trade barrier would most likely be placed on a country you were at war with?

Which trade barrier would likely be used to keep the United States from importing too many foreign goods by placing a limit on them?