Team size and communication lines has non-linear causality

Adding a new team member will increase cost of communication. You might think that this will have a linear input (team size) and output (communication cost), but it actually has a Non-linear causality.

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References

Metcalfe's law (opens new window)

Two telephones (opens new window) can make only one connection (opens new window), five can make 10 connections, and twelve can make 66 connections.

Developing Leaders: 6 Keys to Identify & Develop New Leaders | Lighthouse.com (opens new window)