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Janet Yellen
Federal Reserve Chairman Janet Yellen waits for a hearing of the Joint Economic Committee on Capitol Hill, November 29, 2017.
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Hey readers. Phil Rosen here. As you might guess about a writer, I love to read. 

I've collected hundreds of books over the years, and stacks of paperbacks line the walls of my room. But the most useful knowledge I've learned comes from a very small fraction of those books. 

This is the Pareto principle, more popularly known as the 80-20 rule: Roughly 80% of impact comes from 20% of the causes. 

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A bank teller using a cash counting machine counting dollar bills in a bank branch.
A bank teller using a cash counting machine counting dollar bills in a bank branch.
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A big screen display of stock prices hangs behind traders working at the New York Stock Exchange NYSE.
A big screen display of stock prices hangs behind traders working at the New York Stock Exchange NYSE on May 9, 2022.