"Qualitative arguments to the contrary, the back-of-the-envelope numbers indicate that price inflation will not be sufficient to overcome the falling velocity of money and, therefore, even nominal GDP is unlikely to grow. It follows that the forecast Twelve Month Trailing earnings (GAAP adjusted by Standard and Poor) will unlikely show any growth on the year immediately preceding the financial meltdown. The forecast P/E ratio of 24.3X is therefore â??wildly optimisticâ?? in terms of historical benchmarks, given that high P/E ratios typically anticipate strong growth. The facts show that whilst the world economy may or may not bounce from its current low levels, even if it does bounce, the forecast earnings of $43.58 seems highly unlikely.
When investors finally come to understand that it is only in Peter Panâ??s Never Never Land that age and gravity can be defied, there will likely be a downward adjustment of P/E ratios to at least historically â??normalâ?? levels of 15X and perhaps as low as 10X.
In terms of the chart below, courtesy DecisionPoint.com, the most likely outcome is a fall in the S&P to around the 500 â?? 600 level â?? which is the 77 year trend line."
http://www.marketoracle.co.uk/Article13718.html
In English: stock prices are currently at a level reached during boom times. The earnings are just not there though. So the market will have another crash.