One of the most important characteristics of systems of stratification is
Their degree of flexibility.In an open system of stratification:

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An open system of stratification is characterized by social mobility, meaning people's positions can change throughout their lifetime based on their achieved statuses. This is in contrast to a closed system of stratification, where people's positions are determined solely by their ascribed statuses and there is little to no social mobility. The boundaries between levels in an open system may be more flexible than those in a closed system, but they are not necessarily rigid.

One of the Most Important Characteristics of Systems of Stratification