How much of something do we have?
Quantities of a good or service that producers are willing to sell at market prices. The law of supply is when prices fall, the quantity fall. We don't have a unlimited supply of anything we will run out of everything eventually, the demand for the product must be lower than the supply or a shortage will occur. With supply it makes the product easier to get, we have a supply of everything, there can not be supply theres always something we have more than one of. The supply on the product affects the price, usually when there's less of the product like diamonds the price goes up because of the scarcity of it.