Introduction
Gérard Debreu is a French economist widely known for his work ongeneral equilibrium theory, which was published in a book titledTheory of Value: An Axiomatic Analysis of Economic Equilibrium. This bookwas published in 1959 and presented an axiomatic approach to economics which he called “general equilibrium theory.” His most famous contribution to economics is probably the notion of Walrass Law. This law states that in any economic system, the total quantity of goods produced must equal the total quantity demanded.
History of General Equilibrium Theory
Theories of general equilibrium originated in the eighteenth century with Adam Smith’s famous idea of an “invisible hand” guiding market activity. Smith theorized that when market participants, such as buyers and sellers, responded to incentives, pursuit of their own interests would inevitably lead to the greatest benefit of all. This idea of the market being guided towards the maximum benefit of all was further developed by the French economist Jean-Baptiste Say. Say argued that when the laws of supply and demand interacted for the purpose of finding a price for a good, it meant that buyers and sellers were constantly trying to find a balance between what they wanted to buy and sell for. Over time, Say argued, this equilibrium, a balance between what buyers wanted to pay and what sellers wanted to receive, would be found.
Walras’s Theory
The theory of general equilibrium was further developed by the Swiss-French economist Leon Walras. Walras adapted Say’s theories and developed a set of equations to represent how supply and demand could create an equilibrium in the economy. Walras argued that the economy had three basic types of markets: the input market, the output market, and the transfer market. In the input market, resources were bought and sold, while in the output market finished products were bought and sold. Lastly, the transfer market was where individuals could transfer “goods” such as money or stocks between one another.
In Walras’s vision of the economy, each of these markets had its own set of equations based on supply and demand. These equations represented how much buyers and sellers of each type of good (be it resources, finished products, or money) would pay or receive in a given market at both the quantity and price levels. Walras theorized that when all of the equations for each of the markets were solved, the markets would come to a point of equilibrium. This point of equilibrium was Walras’s Law, wherein the total quantity of goods supplied was equal to the total quantity of goods demanded.
The General Equilibrium Theory Today
Today, the theories of general equilibrium are widely studied and used in economic analysis. The key principle of the theory still stands: when all of the markets in an economy are allowed to reach equilibrium, prices, quantities, and the entire structure of the economy will be in balance. The theory is used to solve the problem of market failure, wherein markets do not function efficiently due to external factors. The use of general equilibrium theory allows economists to study how these external factors might affect the overall market and how best to ensure that the markets are functioning to their fullest potential.
Conclusion
In conclusion, the general equilibrium theory is a very important concept in economics today. It was first formulated in the eighteenth century by Adam Smith and Jean-Baptiste Say, and was further developed by the Swiss-French economist Leon Walras in his book The Theory of Value: An Axiomatic Analysis of Economic Equilibrium. The general equilibrium theory is now widely used in the study of market failure, as it can be used to quantify how external factors can affect the efficient functioning of markets. In this way, economists can use the general equilibrium theory to better understand the workings of the markets and how to ensure their optimal performance.