Today, I was directed towards a great speech by Andrew Haldane titled “The dog and the frisbee“.  One quote in particular caught my eye as a great summary for the paper:

Take decision-making in a complex environment.  With risk and rational expectations, the optimal response to complexity is typically a fully state-contingent rule (Morris and Shin (2008)).  Under risk, policy should respond to every raindrop; it is fine-tuned.  Under uncertainty, that logic is reversed.  Complex environments often instead call for simple decision rules.  That is because these rules are more robust to ignorance.  Under uncertainty, policy may only respond to every thunderstorm; it is coarse-tuned.

The paper goes on to cite several examples that promote simple heuristics over complex rules under uncertain and complex environments.  To quote: “Less is more, at least without much (much) more data.”

I highly recommend the read.

Corey is co-founder and Chief Investment Officer of Newfound Research, a quantitative asset manager offering a suite of separately managed accounts and mutual funds. At Newfound, Corey is responsible for portfolio management, investment research, strategy development, and communication of the firm's views to clients. Prior to offering asset management services, Newfound licensed research from the quantitative investment models developed by Corey. At peak, this research helped steer the tactical allocation decisions for upwards of $10bn. Corey holds a Master of Science in Computational Finance from Carnegie Mellon University and a Bachelor of Science in Computer Science, cum laude, from Cornell University. You can connect with Corey on LinkedIn or Twitter.