supply in economics

Supply in economics means how much of a certain product or service is available in the market. For example, if there are 10 boxes of apples in a store, that's the store's supply of apples. The store might want to sell as many apples as they can, but they may only have 10 boxes, so their supply is limited. If more people want apples than there are boxes of apples, the store can't sell anymore because they have reached their supply limit. So, supply tells us how much of something is available in the market.