to provide someone or something with something from some source. I supplied ice cream to the new restaurant from a very expensive source. We supplied nuts from a pushcart. Frank supplied nothing at all to them.

the availability of things or people as compared to the need to utilize the things or people; the availability of goods compared to the number of willing customers for the goods. Sometimes you can find what you want by shopping around and other times almost no store carries the items you are looking for. It depends entirely on supply and demand. (Alludes to a principle of market economics.) Sometimes customers ask for things we do not carry in stock and other times we have things in abundance that no one wants to buy. Whether or not we can make money off of a product depends entirely on supply and demand.