Answer:
Infant-industry argument
Explanation:
Infant-industry argument says that a particular industry can't compete with other international competitors because of the economies of scale. So, they demand a temporary protection until they gain economies of scale to be ready to compete on a level playing field.
Note: This can also come in the category of 'unfair competition' argument as huge economies of scales of well established companies create an unfair environment for nascent industries to compete on a same level.