To me, the idea of infinite memory processes is one of the most important concepts touched on by Mandelbrot in this book. It suggests that economists and traders should be developing models and theories which value the importance of price series and data going back decades. And it makes sense to me that people and prices do not change their fundamental behavior over extended periods of technological evolution. However, I suspect that organisms do change their fundamental behavior if the time horizon is thousands or millions of years. I am very curious to read more about Hurst’s studies of the Nile.