Bosses who outlast their rivals also tend to outperform them on the stock market, according to a new analysis. Companies led by executives with 15 or more years of experience are vastly more likely to see their stock prices climb, the report found. And while analysts say there's a degree of selection bias at work, they also believe well-seasoned bosses are simply better at keeping employees and customers happy. "You take care of employees. They take care of customers. And that takes care of Wall Street," says Peter J. Rose, the 67-year-old CEO of Expeditors International of Washington.