I have just finished a short article and posted it on my blog in which I argue that the world's economic system is like a control system with positive feedback and is, therefore, unstable. The positive feedback arises from the behavior of individuals who retrench and hold back on their own economic activity during recessions, therefore collectively making the recession worse (positive feedback). Similarly, in good times they spend more than they should and go into debt to speculate on houses, stock shares, and the like (positive feedback again). I also argue in favor of strong government intervention to smooth out the extremes in the consequent business cycle by providing temporary jobs and unemployment benefits during severe recessions and tax increases and strict regulation to discourage speculation during good times. Rather than repeat the article here, I invite you to read it at my blog: http://albertjsaur.blogspot.com