The stock market is about to get a signal to buy - and it's 'old economy' sectors like materials that will be worth a look, Bank of America says

• A buy signal is about to flash for stocks, Bank of America said Wednesday. 
• The S&P 500 is hovering close to the firm's year-end target of 4,000. 
• Investors should take a look at "old economy" sectors like materials and energy. 

Investors are sitting at the edge of a signal to buy stocks, and the best way to maneuver through the potential rush will likely be in the so-called "old economy," said Bank of America.