1. Quota- Only allow a certain number of an item or import/export by a country
Embargo- Prevent import or export to a set nation or nations
Protectionist- belief that trade barriers are keeping jobs in a nation.
A weak currency is good for exports. Your product will be cheaper and more people will buy over seas. More people are employed.

2. A strong currency will slow down trade with other countries and hurt jobs here
Strong currency is worth more than another countries. British Pound is now worth $2.50 to our $1. This means the British Pound is stronger than the US Dollar.
Trade Barriers are important. They are government regulations. One could be testing standards or quotas. Example- Lead content in toys

3. Tariffs are taxes placed on imports. They are part of barriers to trade