ByDaniel R Moore:As the Dow Jones Industrial average (DIA) breaks through its all-time high and the S&P500 (SPY) is bumping up against the range, investors want to know: Is this an okay time to keep buying?
To make this assessment, an investor needs to do a relative assessment based on where the market is currently trading. In the case of the S&P 500, the most used conventional model is the PE multiple. It is simple in concept. If you have the data, take the current trading value of the index and divide by the current level of earnings of all the companies in the index to get the PE ratio. Then, you can interpret the ratio relative to current expectations for earnings and possibly relative to where the ratio has been in past similar market conditions to judge whether the market is over or undervalued.
But is this a good way to
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