I have been thinking about this being poor thing. Isn't it like all of the losing weight advice. Earn more, spend less and save more simple to do it. It is all

I have been thinking about this being poor thing. Isn't it like all of the losing weight advice. Earn more, spend less and save more simple to do it. It is all about money in and money out. If you have more money coming in and less going out you will be rich. Trivial advice to follow and anyone should be able to do it right?