Sources:

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1 -  https://www.mckinsey.com/industries/oil-and-gas/our-insights/the-importance-of-cultural-integration-in-m-and-a-the-path-to-success

 https://www.financierworldwide.com/culture-clashes-in-ma-new-perspectives

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2 - 33% stat: Daniel Kim, "Predictable Exodus: Startup Acquisitions and Employee Departures," MIT Sloan

47% key employees stat: EY (Ernst & Young), referenced via Gallup Workplace research

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