Correction: In the Friday email, commentary and, video I used an erroneous calculation of compound interest to draw exaggerated conclusions. This has now been corrected in the copy and a new big picture video has been posted. I want to explicitly apologise. I’ve been losing sleep at the enormity of shame I feel at such a schoolboy error and suffice to say it will not recure. It also tells me that stress comes at a cost, and I need to be more careful with my position sizing in my personal trading.