there is no monopoly supply now so telling you this you have to imagine what exactly supply curve is supply curve it is the relationship between the price and the quantity demanded it's a positive relationship between price and constitutive model when price increases quantity supplied increases in case of monopolist this might happen I am NOT saying this will always happen but this might happen that when price increases quantity supplied Falls okay so there's an instance in which law of supply is not functioning note that this has to be a law it should hold it every point for every price and quantity combination there are no exceptions to this okay so since this is not functioning in a normal fashion so we say that there is no monopoly supply curve okay now this is the normal a are in M R curve of the monopolist this is the MC curve and here the equilibrium is drawn fine let us just see this is the amount of equilibrium quantity and this is the amount of equilibrium price this is the price which you have and this is the Q star is the amount of quantity which you have here getting now supposedly if you change if you shift the AR curve okay in case the demand curve shifts of course mr curve will also shift supposedly if you shift the AR curve fine so I am going to keep this as this but this is the shifted AR curve this take AR curve like this and corresponding to that this is the mr curve which you have getting getting so equilibrium is going to lie here this is sayi - at this point fine as you could see this is the equilibrium quantity and this one is the equilibrium price so this is say P - and this is aq - so what have you seen you have seen this that even though price has increased but quantity has fallen the quantity which this monopolist is offering in the market has fallen so law of supply is not holding in this instance okay this recording doesn't mean to say that this will this will always be the case no it depends on various conditions it depends on demand conditions it depends upon the amount of shift which this demand curve has it also depends upon the elasticity of the demand curve just see this the new AR and mr curves this is AR - and mr - curves not only the shift has changed but also the elasticity has changed going to the point so it depends upon various things okay so this might happen that law of supply is not holding and only one instance is enough to show that law of supply is not working in this case and that is the reason is say that there is no monopoly supply curve