In the current session, Aon Inc. (NYSE:AON) is trading at $342.07, after a 0.64% decrease. Over the past month, the stock fell by 0.32%, and in the past year, by 0.96%. With performance like this, long-term shareholders are more likely to start looking into the company's price-to-earnings ratio. Comparing Aon P/E Against Its PeersThe P/E ratio measures the current share price to the company's EPS. It is used by long-term investors to analyze the company's current performance against it's past earnings, hist ...