In survival, Nature teaches us that balance is crucial.
Should one species dominate completely then that species will fail, it will cease to exist and will ultimately jeopardise the existence of all others.
In Capitalism, for it to continue as a viable system, advantage must be balanced relatively equally across all sectors.
Should one sector be allowed to dominate (i.e. The Financial sector), at the expense of all others, that sector will fail and drag every other down with it.