The correct answer is “high tariffs between competing nations”
Tariffs are a tax that is used by a country on other nation’s imported goods or services. This is used to protect the national industry because the other countries product is cheaper than the national one.
High tariffs create protectionism and shield’s national economy from a healthy foreign competition.
In a globalized world, nations have to lower trade barriers so products around the world are sold to all nations without any protections.
Some countries defend tariffs because they defend that labor rights and slave conditions may increase or decrease products values and this might harm prices in that nation.