For those of you who derive most of your income from trading, do you worry that something could change that would force you to change careers? It could be anything, from new legislation that makes frequent trading prohibitively costly, or the big players automated trading becomes so good that only those with massively expensive infrastructures and advantages of scale can compete? Or maybe things just change and the edges you once had slowly are no longer profitable? Are these real concerns, or if you work hard consistently to stay on top of how the landscape is changing and always looking for new and better edges, will there always be a way to live off trading income?
