The Cashflow Quadrant is a book that can be called the key to financial freedom. According to Robert Kiyosaki, the cash flow quadrant divides the world's money earners into four categories. He said every person in the world earns money by living in one or more of these four quadrants. These four quadrants are – E (Employee), S (Self Employed), B (Business Owner), and I (Investor). Which quadrant should be so that you can be rich? What should you do about this? You must read this book to become rich.