In the financial industry, I believe that the main reason most people lose money has always revolved around one issue: leading stocks versus small-cap stocks, low-expectation slow and steady returns versus high-expectation high-growth high-risk. As long as you can abandon your own smallness and believe you're not qualified to buy XX leading stocks, you are basically making money. Conversely, those who like to gamble on small, high-risk stocks may often end up underperforming expectations.