This week Nike, Inc. (NKE) officially entered a bear market when the 50EMA dropped below the 200EMA, the first time in over three years. While this is my nominal definition of a bear market, it is useful as an objective measure of price performance, and it is similar to the widely recognized (and more dramatically named) “death cross,” which is derived from simple moving averages. It is not necessarily an actionable SELL signal, rather it warns that the long-term environment has turned bearish for this stock. The last time the 50EMA was below the 200EMA was over three years ago.