We all want to be financially stable and enjoy a well-funded retirement, but we don't want to squander our hard-earned money on poor investments. In this penultimate Floating University video, William Ackman, the CEO of Pershing Square Capital, navigates the complex landscape of how businesses work and how to make smart investments following a simple business model we can all relate to: a lemonade stand.

Why did Albert Einstein say the most powerful force in the universe is compound interest? Through questions like these, you will learn both what it takes to finance and grow a successful business and how to make sound investments that will allow for a cash-comfy retirement.

The principles outlined in this lecture will also benefit your decision-making when it comes to major financial decisions like buying a home, providing for a family, and developing your career.

This video is part of Big Think's Floating University video playlist, featuring some of the most mind-changing ideas delivered by America's leading thinkers. There are 11 other discussions waiting to feed your mind and spark your imagination. Check out the entire Floating University. Enjoy!