Maybe it was the summer lull, but I seem to have been reflecting more than usual. Last month, I pondered the positive long-term experience of my stock investing friend, and more specifically, his successful compounding of capital over 25 years and through three financial crises. Today, I want to draw some practical lessons from his success. Be an investor, not a trader. Among much else, John Maynard Keynes was the most famous and influential economist of the 20th Century. As the central figure labouring to rebuild the war-ravaged global economy at Versailles and then Bretton Woods, his insights still resonate…