October tends to make many investors nervous, since that’s when some of the biggest crashes in market history have happened. This October, though, the market seemed unstoppable. The S&P 500 closed at a record high seven times and ended the month up 4.5%. The market climbed even after October began with a partial government shutdown. Instead of selling off stocks, investors focused on what many say matters most: the Federal Reserve. Its stimulus program has helped to create a stock market rally. With October’s gains, the S&P 500 is up 23.1% for the year so far, the Dow is up 18.6%, and the Nasdaq has gained 29.8%.