The support, agreement, and commitment obtained from all parties who have an interest in or are affected by a project or decision.
Combines 'stakeholder' (1960s, originally from gambling - one who holds stakes) with 'buy-in' (poker term from early 1900s for the cost to enter a game). The business phrase emerged in the 1980s-90s during the rise of participatory management.
Both components come from gambling, creating a phrase that perfectly captures the risk and investment nature of business decisions. Getting 'buy-in' literally means getting people to put their chips on the table - their reputation, resources, and commitment at stake.
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