2020 has been a volatile year for the stock market. Volatile means sharp moves downward as well as sharp moves upward. We've seen historic swings in both directions, and these swings make people nervous. Some people react in these situations and let their emotions dictate their portfolios by moving into cash. However, successful investors like Warren Buffett, also known as the Oracle of Omaha, consistently rely on one trait to navigate nerve-wracking times. The simple trait: optimism.