Level of supply

The number of supplies or material authorized or directed to be held in anticipation of future demands [Балабін & Гардера, c. 185].
And itself, supply is a fundamental economic concept that describes the total amount of a specific good or service available to consumers. Supply can relate to the amount available at a specific price or across a range of prices if displayed on a graph. This relates closely to the demand for a good or service at a specific price; all else being equal, the supply provided by producers will rise if the price rises because all firms look to maximize profits [Investopedia].