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A mediating variable is a variable that helps to explain the relationship between an independent variable and a dependent variable. In other words, it is a variable that comes between the cause and the effect in a causal chain. For example, if we are studying the relationship between social class (independent variable) and intellectual flexibility (dependent variable), a mediating variable could be work. Work could mediate the relationship between social class and intellectual flexibility, as individuals from different social classes may have different types of work experiences that influence their cognitive flexibility.
The proximity principle, as described in Chapter 4 on social class, refers to the idea that individuals are more likely to form relationships with those who are physically close to them. This principle is related to mediating variables in the sense that the proximity of individuals to certain social structures (such as work environments) can influence the mediating variables that explain the relationship between social structure and psychological characteristics.
In the context of SSP research, the focus is on understanding how social structure, such as social class, influences individuals' psychological characteristics. For example, research on social class and work experiences has shown that individuals from different social classes may have different types of work environments and experiences, which in turn can influence their cognitive flexibility. Individuals from lower social classes may have jobs that require more routine and repetitive tasks, while individuals from higher social classes may have jobs that require more creativity and problem-solving. These work experiences can mediate the relationship between social class and intellectual flexibility, highlighting the importance of mediating variables in understanding the link between social structure and individuals' psychological characteristics.