Where do organizational missions originate? How do you explain the evolution of organizational missions as the organization grows and matures?

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Where do organizational missions originate? How do you explain the evolution of organizational missions as the organization grows and matures? If mission statements are relatively enduring, how often should they be changed? Use the source, Ginter, P., Duncan, J., & Swayne, L. (2018). Strategic management of health care organizations (8th ed.). Hoboken, NJ: John Wiley & Sons, Inc.