It is the division of a large number of people into hierarchies according to their relative wealth, power, and prestige, leading to unequal access to resources and opportunities. Applies not only to nations, but also to people within nations, societies, or other groups
Example
Slavery
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Bonded Labor
This is a system of contracts in which someone sells their body (service) for a period of time in a contract very similar to slavery, except that it is entered into voluntarily