What is CNN’s Fear and Greed Index, and how does it work?

It is wise for investors “to be fearful when others are greedy and to be greedy only when others are fearful,” according to one of Warren Buffett’s classic aphorisms.

​ It is wise for investors “to be fearful when others are greedy and to be greedy only when others are fearful,” according to one of Warren Buffett’s classic aphorisms. Read More Breaking News, Latest News and Videos | CNN