The Circulation Law of Prosperity is about keeping the natural flow and balance in your life going. I think the best possible analogy I could give you would be this; think of water flowing from a mountain stream, it is always the purest, clearest, most sparkling water you will ever see, yet if you were to take that same water and allow it to become trapped in a small pool in the ground it would start to get murky and yucky and life would cease to grow within it.
This works the same way with money and prosperity. First of all you need to get the word money out of your mind because money is not real. Money is something mankind has created to barter and trade with. True prosperity however exists all around you everywhere you go. You simply have to tap into it.
This works best by giving. Simply by giving you will keep the flow going and going forever as long as your continue to give and not take first. So for a literal example you might be down to your last 200 bucks. And maybe your in debt by like 2000 dollars. The idea here is to give that money away. Let it go. Or circulate it. Eventually it will come back to you in a more abundant fashion. Remember the stream. It's always the most clear when it is flowing in full force. And when it stops flowing, it becomes stagnate and gross.
What interesting is that all the laws of prosperity are always a direct reflection of the natural order of nature. Crazy how everything we ever needed to know was built right into the very planet we live on isn't it?