I read the book several years back when it came out . I found the book extremely helpful in allowing you to see where you were if working or building a business. Also the different distinctions between each quadrant, allowed you to see where your were as it related to trading time for money or utilizing a system as pointed out in the c quadrant or investing in the I quadrant.
The key take away from the book was did one want to trade all of their time a way working or learn to change quadrants or be in several quadrants. or learn to invest and begin to mind only your business.. As a employee your first line item of expense is
the other guys business then the consumer debt, credit cards, mortgagees, car loans and the list continues. So in effect we are
minding everyone else's business except our own.
So the cash flow quadrant is critical to understanding where your are and deciding what is the best quadrant to be in Additionally the fundamentals should be applied using your financial statement and learning to focus only on your asset column and putting
investments there to begin generating cash flow which will go up to your income column and also incorporating your business so that you can cut expenses and increase your cash flow further.