Mondays haven’t been kind to portfolios, whether big or small. Indeed, it is the only day of the week that the stock market is more likely to fall than to rise. The Dow Jones industrial average has been down 10 of the past 11 Mondays. And the two worst days in market history were Mondays. Mark Zifchak (left) and Johnathan Corpina, both of Meridian Equity Partners, work on the trading floor of the New York Stock Exchange on July 23, a Monday that saw the Dow Jones industrial average fall 101 points. (Associated Press)