from Washington's Blog.
His analogy with water supplies works very well to understand the banking industries' venture into gambling and the resulting economic chaos.
However, capitalism's periodic busts are caused by other factors also: over production of profitable items whether useful or not, reducing the pay of working people as much as possible, after each economic bust we have more concentration of industries (monopolies) that accelerates the harm the system can cause, and extracting profits from the environment while destroying it.
In the future we will see the exhaustion of resources, extreme weather patterns, and more economic crises. If we allow the system to continue, at some point in time the capitalist system will cause so much ecological instability that it will threaten the very survival of the human race and other life forms.