The single most important source of protectionist policies against trade, according to the text, is the:

Question

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The text states that the desire to maintain existing jobs is the single most important source of protectionist policies against trade. This refers to the belief that imports from foreign countries will lead to job losses in domestic industries, which is a major concern for many policymakers and workers. The infant industry argument, national security argument, and argument against dumping are also commonly cited as reasons for implementing protectionist measures, but they are not as significant as the desire to maintain jobs.

The Single Most Important Source of Protectionist Policies Against Trade