Some tasks, like deciding how a big budget will be spent, or deciding a new office location, should have a lot of people involved. Other tasks, like deciding what color to make the marketing materials or how to spend petty cash, should be autocratically decided and done by one or two people.
The level of consensus or delegation/autocracy depends on the task, and the importance of the task to your coworkers.
Choosing what food will be served for lunch is usually best done by the people who’ll be eating.
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Direct democracy is where everyone decides or acts on everything together. The usual result in large groups: only a few people attend every meeting, make the rules and exclude others, which has a vicious cycle effect. Ironically, when you ask everyone to decide everything, in practice only a precious few unelected people will control everything.
Representative democracy is where people choose representatives to liaise with other groups, or delegates to act on their behalf. Representatives decide the issues their constituents have appointed them to decide, either because of their knowledge or skill or commitment to be present.