Age is not a factor that directly contributes to socioeconomic status. However, it can be correlated with other factors, such as education and income, which do contribute to socioeconomic status.

Income is the most common measure of socioeconomic status because it is a relatively easy to measure and it is a good indicator of a person's standard of living.

Peasantry is not a social class in the modern sense of the term. It is a term that is used to describe a class of people who work in agriculture.

The middle class is the largest social class in the United States. It is made up of people who have a moderate amount of income and education.

The upper class is the smallest social class in the United States. It is made up of people who have a very high amount of income and education.

Low job security is not a characteristic of the upper class. Upper-class people typically have high-paying jobs with a lot of job security.

High job security is not a characteristic of the middle class. Middle-class people typically have jobs with moderate job security.

High job security is not a characteristic of the working class. Working-class people typically have jobs with low job security.

High job security is not a characteristic of the lower class. Lower-class people typically have jobs with very low job security.

Race is not a factor that directly contributes to social mobility. However, it can be correlated with other factors, such as education and income, which do contribute to social mobility.

Intergenerational mobility is the most common type of social mobility. It is the movement of individuals from one social class to another over the course of their lifetime.

Horizontal mobility is not a type of social mobility. It is the movement of individuals from one social group to another within the same social class.

Social unrest is not a consequence of social inequality. It is a consequence of social change.

School vouchers are not a policy that can be used to reduce social inequality. They are a policy that can be used to increase school choice.

Progressive taxation is the most effective policy for reducing social inequality. It is a tax system in which the tax rate increases as the income increases.