The total amount of a product available in a market at a given price is called the

count.
demand.
number.
supply.

Supply

The stock of a commodity refers to the volume of a product accessible in the market for sale during specified period. Both commodity and market price of a product influences its supply to a higher degree.

Supply will determine the current value of the market. When there is an increase in supply, in this scenario the cost will be reduced because it will be easier to obtain the products.  However, when the supply of the products decreased, the price will be raised according to the demand because the product will be difficult to obtain.

it apply by theyre artifacts