Stop "Just Getting By" ... Master the 80/20 Principle and Make More Money without More Work. When you know how to walk into any situation and see the 80/20's, you can solve almost ANY marketing problem. 80/20 can demolish any sales and advertising problem. "If you don't know who Perry Marshall is--unforgivable. Perry's an honest man in a field rife with charlatans." - Dan Kennedy, Author, the Ultimate Marketing Plan If you're a sales and marketing professional, you can save 80 percent of your time and money by zeroing in on the right 20 percent of your market. By page 5 you'll be applying 80/20² and 80/20³ to gain 10X, even 100X the success.