Answer:
work only if other countries do not retaliate with their own trade barriers.
Step-by-step explanation:
Protectionist measures refer to policies governments use to protect their own industries against external competition by imposing restrictions like tariffs and quotas on imports from other countries. Considering that countries engage in international trade, if one country imposes limits on the imports, the other countries will probably do the same to that country which will affect its exports. Because of that, the answer is that protectionist measures designed to limit free trade and protect domestic jobs work only if other countries do not retaliate with their own trade barriers.