In this video, Pieter Praat discusses the concept of Flexibility. He explains that it is a key component of success, and that it can be described as the ability to change and grow. He gives the example of a business with a large variety of sizes, from small to large, and explains that this is something that many people think is a big company with many versions of the small business. He also discusses the example of a mother with a car who must go shopping for groceries every night, and how this type of situation can be solved by using linear programming. Finally, he discusses the challenge of staying flexible in a rapidly-changing world, and offers a solution in the form of a new, small business.