Concept of Supply:
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Supply is defined as the quantity of a product that a producer is willing and able to supply into the market at a given price in a given time period. Supply means the quantity of goods offered for sale at a given price during a specific period of time.

Stock:
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Stock is the total volume of a commodity which can be brought into the market for sale at a short notice.

•Supply is drawn from the stock of the commodity.
•Supply is the actual quantity that a seller is willing to sell at a particular price.
•Depending on the demand of for a commodity stock is converted into supply.
•For perishable commodities stock and supply are the same. (e.g. Milk)
•For durable commodities stock and supply are different. (e.g. TV)