Companies with losses (adverse earnings) or no gain have an undefined P/E ratio (generally proven as "not applicable" or "N/A"); from time to time, however, a negative P/E ratio can be revealed. There is a standard consensus among most traders that a P/E ratio of around 20 is 'quite valued'. https://investing55555.jiliblog.com/87666271/5-easy-facts-about-pe-ratio-definition-described