You really do not know where you fall in the wrong/right curve...
Or...the demand and supply curve...
Sometimes...
Its so hard to attain equilibrium on the curve when you do not know which factors are kept constant...
Sometimes...
There are people who, due to factors such as surroundings, were faced with an increase in demand, need to supply more, and with that, affected other factors such as priorities and the like...
Sometimes...
There are also people stupid enough to not know the market rate/talk and just plunge into the hole...
That hole has no demand and supply curve, only demand... .....................................................................................