Final answer:
The European Middle Ages were characterized by extremely low social mobility.
Step-by-step explanation:
The subject of this question is History. The question asks about the economic characteristics of the European Middle Ages. The correct answer is 'extremely low social mobility'. During this time, social classes were rigidly structured, and it was difficult for individuals to move up or down in society. This lack of social mobility was a defining feature of the European Middle Ages.
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