Driving the complexity of a given system to a
prescribed target value has numerous applications, ranging from
engineering (who wouldn't want a simpler design that performs according
to specs?) to management, advanced portfolio design, wealth management
or investment strategy.

But more than just complexity it is also the robustness of systems that is of most concern. When considering portfolios both diversification and volatility are of concern

We know that in system design (and this applies to portfolios) the mini-max principle, whereby you maximise something (e.g. the expected return) while minimising at the same time something else (e.g. risk) leads to inherently fragile solutions. Taking simultaneously many things to the limit is of course possible but the price one pays is a rigid and fragile solution: you basically push yourself into a very tight corner of the design space where you have little margin of manoeuvre in case things go wrong. And things do go wrong. Especially if you think that most things in life are linear and follow a Gaussian distribution you should prepare yourself for a handful of surprises.

Portfolio diversification and design can be accomplished differently based on complexity and, in particular, on these two simple facts:

- High complexity increases exposure - a less complex portfolio is better than a more complex one.
- A less complex portfolio accomplishes better diversification (more or along the lines of the MPT and Markowitz logic).

Its complexity is 64.3 (pretty close to the critical value of 68.75)

Entropy is 823

Robustness is 66.8%

Rating: 2 stars

Nothing to celebrate.

Suppose now that you wish to increase the
robustness to, say, 85%. Using our Complexity-To-Target Technology it is
possible to "force" the robustness of the portfolio to this target
value. Since robustness and complexity are linked it is possible to do
this either for robustness or complexity or even both. The new portfolio
is illustrated below.

Complexity is now 50.9

Entropy is 542 - this tells us that the behaviour of the portfolio is substantially more predictable

Robustness is 84.9%

Rating: 4 stars

The hubs of the portfolio (red discs) have now changed but that is another matter.

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