![FactSet on Twitter: "The forward 12-month P/E ratio for $SPX is 17.4, above the 10-year average of 14.1. https://t.co/Nfhid2JR2u https://t.co/BU6p3XeqrE" / Twitter FactSet on Twitter: "The forward 12-month P/E ratio for $SPX is 17.4, above the 10-year average of 14.1. https://t.co/Nfhid2JR2u https://t.co/BU6p3XeqrE" / Twitter](https://pbs.twimg.com/media/DJZs_r0W4AA-cIT.jpg)
FactSet on Twitter: "The forward 12-month P/E ratio for $SPX is 17.4, above the 10-year average of 14.1. https://t.co/Nfhid2JR2u https://t.co/BU6p3XeqrE" / Twitter
![Theoretical Roots: Determinants of PE Ratio | This Stock Is So Cheap! The Low Price-Earnings Story | InformIT Theoretical Roots: Determinants of PE Ratio | This Stock Is So Cheap! The Low Price-Earnings Story | InformIT](https://www.informit.com/content/images/chap3_0131403125/elementLinks/03equ04.gif)
Theoretical Roots: Determinants of PE Ratio | This Stock Is So Cheap! The Low Price-Earnings Story | InformIT
![Simon Johnson on Twitter: "...for the period and the ending equity. It can be done either way but calculations will defer base on how this is done." / Twitter Simon Johnson on Twitter: "...for the period and the ending equity. It can be done either way but calculations will defer base on how this is done." / Twitter](https://pbs.twimg.com/media/EqvNqyyXMAAEWsj.jpg)
Simon Johnson on Twitter: "...for the period and the ending equity. It can be done either way but calculations will defer base on how this is done." / Twitter
![Stop Relying on P/E Ratios - Retirement Daily on TheStreet: Finance and Retirement Advice, Analysis, and More Stop Relying on P/E Ratios - Retirement Daily on TheStreet: Finance and Retirement Advice, Analysis, and More](https://www.thestreet.com/.image/t_share/MTkxMzEzODQ3NzU0NDk5Njgy/sp-500-index-forward-pe-ratio---regan.png)