Only 10% of firms around the world achieve a moderate level of sustained and profitable growth over a decade, according to Bain & Co. The primary barrier is mostly internal, says Bain partner Chris Zook in a Harvard Business Review video titled “What Stops Companies From Growing.” Companies that still have the founder deeply involved in the firm are three times as likely to perform dramatically better than others. And this is true even if you remove wildly successful firms from the mix, such as internet wonders Google and Facebook as well as the most valuable company in the world, Apple. Therefore, Zook says that a “founder’s mentality” is the best measure of a firm’s internal health.