People who have access to confidential information or who are accepted members of a group.
From 'inside' plus the agent suffix '-er,' meaning one who is on the inside. The term gained prominence in financial contexts in the 20th century, particularly regarding insider trading.
The concept of 'insiders' reveals our fundamental human anxiety about inclusion and exclusion - every group creates insiders and outsiders, from playground cliques to corporate boardrooms, as a way of defining identity and controlling resources.
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