Britney was released in a month of suppossed big sales. Shakira. doesn't.
They all underperformance/flop, but giving the circumstances (Shakira is hated in the xenophobic USA, while Britney is American Sweetheart, her first single peaked lower than Work Bitch, etc), Shakira. was the most successful, and Britney comes next. But Britney is a flop, Shakira. an underperformance, because no one expected more from her in that country
