The market should be understand as an inner tube inside a wheel. The market is the air inside the inner tube, somewhat under pressure. It has few exchange with the outside. Now imagine the time as the wheel is turning. When the wheel meet an obstacle, the inner tube is compresed and this produces a shock wave. This shock wave runs forward and backward. As the inner tube is a finite wound up world, the shock wave will have irremediably an effect (big or small)... later.
