Day 28 Week 4 Day 7: The Best Mental Shortcut You Will Ever Learn Compounding The Rule of 72 costs nothing to learn and applies to every financial decision you will ever make. Carry it like a pocket knife.... The Rule of 72 costs nothing to learn and applies to every financial decision you will ever make. Carry it like a pocket knife. Lesson Locked This Lesson Is For Paid Subscribers Subscribe to access the full lesson, commentary, and your day-by-day course progression. Start Learning - $9.99/month View Full Syllabus ← Previous Lesson Back to Browse Next Lesson →