Surplus is when there is more of something than is needed. Therefore:

• If there is more budget than needed, there is a budget surplus. If there is too little, there is a budget deficit
• If a business has more of a product available than its customers want to buy at a particular price, an economist would describe the situation by saying the supply is greater than the demand and there would be a "surplus" of the product at that particular price
• In Marxian economics, there are surplus product and surplus value.
• Surplus (movie), a 2003 Swedish documentary movie about consumerism

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