Is it better for the country to have a trade barrier or not

Tariffs and Modern Trade. ... Such organizations make it more difficult for a country to levy tariffs and taxes on imported goods, and can reduce the likelihood of retaliatory taxes. Because of this, countries have shifted to non-tariff barriers, such as quotas and export restraints.

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;

i would say b. research typically uses a variety of sources