There seems to be an unwritten rule on Wall Street: If you don't understand it, then put your life savings into it. Shun the enterprise around the corner, which can at least be observed, and seek out the one that manufactures an incomprehensible product.
Peter LynchWhat makes stocks valuable in the long run isn't the market. It's the profitability of the shares in the companies you own. As corporate profits increase, corporations become more valuable and sooner or later, their shares will sell for a higher price.
Peter Lynch