Shares of Uber Technologies (UBER) have declined 13.2% in the past month, underperforming its industry and the S&P 500 Index, of which Uber is a key member. In comparison, shares of rival Lyft (LYFT) have dropped 16.6% in the same timeframe.One-Month Stock Price Performance Comparison Image Source: Zacks Investment Research The San Francisco, CA-based ride-hailing company’s shares have dropped on concerns that self-driving cars could eliminate intermediary services. Google's (GOOGL) Waymo recently unveiled ...