Lastly I explore the implications of the sub-optimisation theorem, how can we avoid sub-systems seeking to optimise their wellbeing, wealth, or any other variable at the expense of other sub-systems.
> From Asby, p. 95: A third mathematical theorem relevant to us here is the Sub-optimisation Theorem which states that **optimisation of the whole is not achieved by separately optimising the parts**; and therefore in this circumstance the **whole system management must ensure good working relationships between sub-units**.
> In any system there will always be a requirement for restrictions on the freedom of action of the sub-units in order to maintain cohesion of the whole. In other words, there must be **feedback control loops whose purpose is to restrict the freedom** of action of sub-units so that the coherence of the whole system can be maintained.