Augustin Lebron, formerly a trader and researcher at Jane Street Capital and now head of a consulting firm on decision-making, has written a refreshingly cerebral book, The Laws of Trading: A Trader’s Guide to Better Decision-making for Everyone (Wiley, 2019). Although the book’s pitch is that “mental tools, forged in the competitive fire of financial markets, help us make good decisions in all other areas of life,” the book is first and foremost about the principles underlying sophisticated, professional trading.