1:Supply is the amount of a commodity that sellers are able and willing to offer for sale at a different price per unit of time. According to Meyer: “Supply is a schedule of the amount of a good that would be offered for sale at all possible price at any period of time; e.g., a day, a week, and so on”.
2:While Stock is meant the total quantity of a commodity this exists in a market and can be offered for sale at a short notice. The supply and stock of a commodity in the market may or may not be equal if the commodity is perishable, like vegetables, fruits, fish, etc;