1. Trade barriers

2. VOLUNTARY EXCHANGE OF GOODS AND SERVICES AMONG PEOPLE AND COUNTRIES
TRADE
VOLUNTARY EXCHANGE OF GOODS AND SERVICES AMONG PEOPLE AND COUNTRIES
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3. LIMITING TRADE FOR ECONOMIC OR POLITICAL REASONS
TRADE BARRIERS
LIMITING TRADE FOR ECONOMIC OR POLITICAL REASONS
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4. IMPORT
GOODS PURCHACED FROM OTHER COUNTRIES. VEHICLES ARE ONE OF THE TOP 3 IMPORTS IN THE US
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5. EXPORT GOODS SOLD TO OTHER COUNTRIES
ONE OF THE TOP US EXPORTS IS MEDICAL SUPPLIES (ALMOST 6% OF TOTAL EXPORTS)
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6. TARIFF
TAX ON IMPORTS
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7. EMBARGO
GOVERNMENT ORDER STOPPING TRADE WITH ANOTHER COUNTRY EXAMPLE IN THE 1970S WHEN OPEC PLACED AN EMBARGO AGAINST THE US FOR ITS SUPPORT OF ISRAEL.
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8. QUOTA
SPECIFIC LIMT PLACED ON THE NUMBER OF IMPORTS THAT MAY ENTER A COUNTRY
US HAS HAD A SUGAR QUOTA OF NO MORE THAN 15% OF UNREFINED SUGAR CAN BE IMPORTED INTO THE COUNTRY.
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9. SUBSIDY
WHEN THE GOVT OF A COUNTRY GIVES MONEY TO A CERTAIN BUSINESS SO THEY CAN CONTINUE TO COMPETE WITH IMPORTS FROM OTHER COUNTRIES.
The federal government spends more than $20 billion a year on subsidies for farm businesses. About 39 percent of the nation's 2.1 million farms receive direct subsidies, with the lion's share of the handouts going to the largest producers of corn, soybeans, wheat, cotton, and rice.
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10. STANDARDS
WHEN THE GOVERNMENT SETS LIMITS AND RULES IN REGARDS TO IMPORTS AND DOMESTIC GOODS.
US EXAMPLES: pharmaceutical regulations, car safety laws, environmental standards, and food safety standards 
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