Citigroup Inc.'s (C) stock dropped 5.9% in the past month compared with a 1.8% decline in the industry and against a rise of 0.5% in the S&P 500 index, leaving investors wondering whether to take the benefit of the price decline or to wait for a better entry point.When compared with its competitors in the banking space, C's performance is weaker.  Wells Fargo & Company (WFC) shares have declined 4.7%, while Bank of America (BAC) stock fell 0.8% over the same period.1-Month Price PerformanceImage Source: Zac ...