Dentsply Is More Than a Mouthful (The Motley Fool) The Motley Fool - Investing genius Peter Lynch liked to say that to find "tenbaggers," that is, stocks that will increase in value by 10 times or more, you should start by looking close to home. In his book One Up on Wall Street, he also noted he liked to seek out companies in dull, disagreeable industries because they were often overlooked or shunned, giving individual investors a chance to purchase them at a discount.