I totally get what you're saying about the unpredictability of human behaviour. But I don't see the connection to this particular system. It could totally be ch

I totally get what you're saying about the unpredictability of human behaviour. But I don't see the connection to this particular system. It could totally be chaotic if it was modelled as a dynamical system, I don't disagree with that, but as far as I can tell they approached it using neural networks... Chaos isn't an intrinsic behaviour of humans, it's a property arising from specific conditions in a dynamical system. I do think there's been interesting results in trying to model human behaviour (http://www.wilmott.com/pdfs/090610_mandelbrot.pdf http://www.wilmott.com/pdfs/090610_mandelbrot.pdf), but like you I'm hesitant to apply these mathematical models to us irrational humans. Anyway, I'm just being a pedantic math nerd. P.S. Sensitivity to initial conditions alone does not imply a dynamical system is chaotic.