the single biggest risk

Investors who do the least will likely do the best over time. For the huge majority of people, investing a set amount of money each month consistently over a long period of time will outperform any trading strategy they attempt. The evidence on this is overwhelming. It's so overwhelming that I think the single biggest risk you face as an investor is that you'll try to be a trader. It's the financial equivalent of drunk driving -- recklessness blinded by false confidence. "Benign neglect, bordering on sloth, remains the hallmark of our investment process," Warren Buffett once said. It probably should be yours, too.