This is the best analysis I've read on validity and usefulness of CAPE **JB**
Sep 21, 2017 ROBERT J. SHILLER
The US stock market today looks a lot like it did at the peak before all 13 previous price collapses. That doesn't mean that a bear market is imminent, but it does amount to a stark warning against complacency.
NEW HAVEN – The US stock market today is characterized by a seemingly unusual combination of very high valuations, following a period of strong earnings growth, and very low volatility. What do these ostensibly conflicting messages imply about the likelihood that the United States is headed toward a bear market?