Tesla at TF: But whether the rally ends now or later, it must end because corporate earnings are crashing, and because price/earnings ratios are going through the roof. This is not a "maybe," and this is not something that will happen unless President Obama does "X". There is nothing that can be done.
P/E
This means that most of the economic predictions handed out are bogus. Everyone uses P/E ratios to determine future earning, capital formation potential, employment and credit creation rates.