A single spreadsheet used locally is probably the best imaginable tool for answering "what if I changed that."
That same sheet shared across an organization suddenly becomes a game of "what caused that change."
Some random sheets I've used, neither made by me nor about business:
https://docs.google.com/spreadsheets/d/1m08haqvTiXKIh4c7y4uM...
https://docs.google.com/spreadsheets/d/1Fo_-HebVr_9PruE94LgT...