Publicis Groupe continues to reap the benefits of the strengthening dollar and pound sterling, announcing that second-quarter revenue rose 39 percent to $2.7 billion. But a more telling indicator, organic growth - which removes the impact of currency swings and acquisitions - shows the company grew by only 1 percent in the period, trailing competitors like Interpublic, which reported an increase of 7 percent in second-quarter organic revenue growth, and Omnicom, which reported 5 percent .