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Although precise measurements of what determines social class in society have varied over time, wealth, power and prestige are still considered one of them.
Wealth: a measure of how much a person has in savings, investments, real estate, and cash, less any debts.
Power: ability to be in charge or to rule
Social prestige: esteem, respect or admiration by others usually related to physical ability, intelligence, heritage, achievements, beauty or occupations that are better paid or "valued" than others, from doctors, corporate lawyers, financial experts, etc. to garbage collectors and janitors.
In our society, all of these characteristics determine one's social status, and they are closely associated with the education, healthcare, leisure and physical possessions we are able to access. There are 5 social classes: Upper Class, Upper Middle Class, Lower Middle Class, Working Class and Poor.