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In economics, an excess supply, economic surplus market surplus or briefly supply is a situation in which the quantity of a good or service supplied is more than the quantity demanded, and the price is above the equilibrium level determined by supply and demand. That is, the quantity of the product that producers wish to sell exceeds the quantity that potential buyers are willing to buy at the prevailing price. It is the opposite of an economic shortage (excess demand). In cultural evolution, agricultural surplus in the Neolithic period is theorized to have produced a greater division of labor, resulting in social stratification and class. Prices and the occurrence of excess supply illustrate a strong correlation. When the price of a good is set too high, the quantity of the product demanded will be diminished while the quantity supplied will be enhanced, so there is more quantity supplied than quantity demanded. The occurrence of excess supply either leads to the lowering of the price or unsold supply, the latter reflecting excess supply. Lowering the price of a good encourages consumers to purchase more and suppliers to produce less. Disequilibrium (economics) A disequilibrium occurs due to a non-equilibrium price giving a lack of balance between supply and demand. Excess supply is one of the two types of disequilibrium in a perfectly competitive market, excess demand being the other. When quantity supplied is greater than quantity demanded, the equilibrium level does not obtain and instead the market is in disequilibrium. An excess supply prevents the economy from operating efficiently. Excess supply in a perfectly competitive market is the "extra" amount of supply, beyond the quantity demanded. As an example, suppose the price of a television is $600, the quantity supplied at that price is 1000 televisions, and the quantity demanded is 300 televisions. This illustrates that sellers are seeking to sell 700 more televisions than buyers are willing to purchase.

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Shortage

In economics, a shortage or excess demand is a situation in which the demand for a product or service exceeds its supply in a market. It is the opposite of an excess supply (surplus). In a perfect market (one that matches a simple microeconomic model), an excess of demand will prompt sellers to increase prices until demand at that price matches the available supply, establishing market equilibrium. In economic terminology, a shortage occurs when for some reason (such as government intervention, or decisions by sellers not to raise prices) the price does not rise to reach equilibrium.

Effective demand

In economics, effective demand (ED) in a market is the demand for a product or service which occurs when purchasers are constrained in a different market. It contrasts with notional demand, which is the demand that occurs when purchasers are not constrained in any other market. In the aggregated market for goods in general, demand, notional or effective, is referred to as aggregate demand. The concept of effective supply parallels the concept of effective demand.

Aggregate supply

In economics, aggregate supply (AS) or domestic final supply (DFS) is the total supply of goods and services that firms in a national economy plan on selling during a specific time period. It is the total amount of goods and services that firms are willing and able to sell at a given price level in an economy. There are two main reasons why the amount of aggregate output supplied might rise as price level P rises, i.e., why the AS curve is upward sloping: The short-run AS curve is drawn given some nominal variables such as the nominal wage rate, which is assumed fixed in the short run.

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