What are the Possible Secondary Problems with P/E Ratio Analysis of a Company, or an Industry?
Possible secondary problems with the P/E ratio include the following: • P/E ratios use historical data. Historic data is not always a sound basis for future earnings. • Historic accounting policies can vary significantly between countries (for example there are significant differences between UK GAAP and US GAAP). • The P/E can vary due to short-term influences (eg recent poor historic results).