What is the main variable to consider when distinguishing between a 'closed' society and an 'open' society?

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The main variable to consider when distinguishing between a 'closed' society and an 'open' society is the degree of social mobility individuals are allowed. In closed societies, social mobility is limited, and individuals are likely born into a certain social class and remain there throughout their lives. In open societies, social mobility is easier, and individuals have more opportunities to move up or down the social ladder based on their abilities and choices.

What Is the Main Variable to Consider When Distinguishing Between