This is the Chaitin of Kolmogorov-Solomonoff-Chaitin complexity, if the argument seems familiar.<p>I like Grassberger-Crutchfield-Young (<a href="http:&#x2F;&#x2F;www.scholarpedia.org&#x2F;article&#x2F;Complexity" rel="nofollow">http:&#x2F;&#x2F;www.scholarpedia.org&#x2F;article&#x2F;Complexity</a>, look for Statistical complexity) complexity, because it can actually be measured.<p>I had long suspicions that Chaitin was a Leibnitzian, but there you go. I like thinking about the Principle of Sufficient Reason, too, but I have long suspected the phenomenon of causality can be more simply explained by positive feedback effects _only_. (<a href="http:&#x2F;&#x2F;howonlee.github.io&#x2F;2016&#x2F;01&#x2F;21&#x2F;Poking-20At-20Causation1.html" rel="nofollow">http:&#x2F;&#x2F;howonlee.github.io&#x2F;2016&#x2F;01&#x2F;21&#x2F;Poking-20At-20Causation...</a>)