Down more than 15 percent since peaking in late January, shares of Citigroup Inc C should now be bought, according to Deutsche Bank. Deutsche Bank's Matt O'Connor upgraded Citigroup from Hold to Buy with a price target lifted from $74 to $76. SourceUpside still holds. The price may reach the upper edge of the falling wedge. We can also expect a breakout. $C, Citigroup, Inc. / D