The Wall Street Journal reported that Starboard Value LP, which has acquired a 1.7 percent stake in Dollar Tree, believes that Family Dollar has served as a drag on its parent company stock price. Shares of Dollar Tree have fallen 15 percent over the past year while rival Dollar General's share price has risen by a similar percentage over the same period. What gives the Starboard Value assertion some credibility is that other investors have also "grown frustrated" with Dollar Tree's stock performance.